US877232A - Web-controller for presses. - Google Patents

Description

No. 877,232. PATENTED JAN. 21, 1908.

' P. W. ROLLAND, JR.

WEB CONTROLLER FOR P'RESSES.

APPLICATION FILED OOT. 30.1907.

FREDERICK W. HOLLAND, JR, OF CHICAGO, ILLINOIS.

WEB-CONTROLLER FOR PRESSES..

Specification of Letters Patent.

Patented Jan. 21,1908.

Application filed October 30, 1907. Serial No. 399.877.

To all whom it may concern:

Be it known that I, FREDERICK W. ROL- LAND, Jr., a citizen of the United States,

residing at Chicago, in the county of Cook, and State of Illinois, have invented new and useful Improvements in Web-Controllers for Presses, of which the following is a specification.

My present invention relates to improvements in devices for controlling the unwinding movement of rolls of paperand other material which forms a web, ,such as used in rinting presses of the web type, and it has or its objects to produce a controller of this character that is capable of starting the unwinding movement of the roll gradually and with a minimum resistance in order to avoid sna ping of the web when the press is started, an that so operates when the press is stopped, that the unwinding movement of the roll is arrested in a Way that will prevent slack in the web.

Another object of the invention is to provide a device of this character that is capable of being adjusted at a relatively low tension during the starting movement of the roll as when the press is being started, and after the latter has attained full speed, an additional amount of tension may be applied that will retain the web in proper condition during the operation of the parts.-

To these and other ends, the invention consists in certain improvements, and combinations and arrangements of parts, all as will be hereinafter more fully described, the novel features being pointed out particularly in the claims at the end of the specification.

In the accompanying drawing-Figure 1 is a side elevation of a roll supporting rack showing a paper controlling device constructed in accordance with the present invention; Fig. 2 is a side elevation of the parts shown in Fig. 1; Fig. 3 is an end view of the roll supporting shaft showing the controlling device thereon, the springs being partially tensioned; Fig. 4 represents a section on the line 4'4, of Fig. 5; and Fig. 5 represents an axial section through the controller.

Similar arts are designated-by the same reference characters in the several views.

It will be understood, of course, that a controller constructed in accordance with the present invention, is capable of being emplymg a fresh roll of paper.

ployed generally in connection with rolls of paper and other material for the purpose of facilitating the starting of the unwinding movement thereof, and for arresting its unwinding movement so as to prevent undue slack .of the web when the feeding of the latter has been interrupted, and in the present instance, the controller is shown in connection with a printing press of the type that receives the paper in the form-of a continuous web from a paper roll.

In the resent embodiment of the invention, 1 and 2 re resent the uprights of a rack that is arrange in line with the press and is provided with brackets 3 and 4, that are adapted to receive the roll supporting shaft 5', the latter being passed through the central opening of the roll as is usual, and is arranged 7 to turn with the roll, a pair of clamping collars 7 being shown in the present instance which engage the opposite ends of the roll 8 and are secured in clamping position upon the shaft by means of set screws or equivalent devices 9. The strip of paper leading from the roll, of course, constitutes the web which leads to the feed rollers of the press and receives the impression from the type of the latter.

The controller shown in the'present embodiment of the invention, comprises a brake drum 10 which in the present instance is in the form of a pulley preferably provided with flanges 11 between which the divided brake bands 12 and 13 engage, the brake bands being preferably semi-circular in form and hinged at one side of the drum to a pin 14 which is secured to a relatively fixed bracket 15, and the pressure and consequent friction This screw is so constructed that it may be removed or otherwise adjusted to disconnect the brake bands and thereby permit a pivotal movement of the latter that will enable the bands to be opened and thereby release the drum-when the shaft is removed from the supporting brackets for the purpose 0 drum is loosely mounted on the shaft, that is to say, it is capable of rotatingrelat vely thereto, and it isheld in operative posltion by means of a pair of collars 19 and 20 that are arranged on opposite sides of the web 21 f sulp- This bra e ofv the drum, said screws or equivalent devices 22 and 23 serving to secure the two collars rigidly to the shaft so as to prevent relative longitudinal or rotary movement between the parts. v

Between the brake drum and theshaft of the paper roll is interposed a compensatin med1umthat serves to effect the graduiil starting of the unwinding movement of the roll when the press is set in operation, and for arresting the movement of the roll to prevent undue slack in the web when the press is stopped. In the present instance a pair of spiral springs 24 and 25 are employed, these springs having their inner ends secured respectively to the collars 19 and 20 which rotate with the shaft, and their outer ends-are attached to the brake drum, the

direction of winding of the two springs being similar to and is determined according to the direction in which the roll rotates to effect the unwinding of-the web, theobject being to set or tension the springs when the roll is rotated in av direction of unwinding the web,

"provided rotation of the brake drum is resisted by the brake bands. The s ring resistance thus interposed between t ebrake drum and the paper roll will act to retard or I resist the unwinding movement of the roll with a yieldin force, but in order to enable the brake ban s to be adjusted so as to exert a considerable braking action on the roll,

suchfor instance as when the press is in full operation, it is preferable to provide amore or less positive stop that serves to'form a posltlve drlving connection between the shaft and drum after the tension of the s rings has exceeded a given limit, the'stop s own in the present instance comprising a radiallyprojecting arm 27 that is suitably arranged tov rotate with the shaft, it forming sprrings, and after the shaft has been rotatedt ough a proximately a revolution relatively to t e brake drum, this arm willcooperatewith the opposite sideof the projection and thereby provide a more or less positive driving connection between the shaft and the drum. In order tov eliminate'shock between the arm 'ontheshaft and the co-' operating projection on the drum, it is preferable to Iprovide one ofthe parts with a ing a stem 29 that is guided to reciprocate vin the-"plane of movement of the arm and has a head 3Q thereon which is adapted to vplug-age the projection 28 on the drum, a

cal: spring 31 encircling the stem of the ock absorber, that shown in the. present instance comprising a plunger havbrake drum if so desired, it being understood that this feature of the invention is not necessarily limited to the. exact arrangement shown.

I In practice, the usual shaft 5 is inserted in the central opening through the paperroll before the latter has been lifted and placed upon the rack, the-shaft. being removed from .the rack for this purpose after the brake bands'have been openedtodisengage the brake drum. The roll may then beplaced upon the rack, the brake bands being adj usted upon the periphery of the drum and the screw 16 setso that a reduced amount of friction is produced between the brake bands and the drum that will resist turning move ment of the latter. The strip of paper from the roll is, of course, introduced into the press and the feeding movement thereof is effected by the usual feed rolls when the press is started, the movement'of the web causes an unwinding movement of the roll, and the shaft 5 turning with the latter causes the arm 27 to leave the projection-28 and rotate relatively to the brake band, and'therefore the starting of the roll may be accomplished with a minimum tension of the web for the; reason that the springs permit a limited degree of rotation between the shaft of the roll and the brake band. After the roll has completed approximately a full revolution that usually is sufficient to start the roll in full speed or accelerate the roll until'normal speed is attained, the arm 27 on the shaft reaches'a position opposite to the projection on thebrake drum, the buffer serving to produce a substantially positive driving connection between thearm and projection so that during the normal operation of the roll, the brake bands may be adjusted-to any extent in order to obtainthe requisite or desired braking action. In stopping'the press -more or less suddenly, the tendency of the roll as usually mounted, is. to run ahead and thereby produce an undue amount of slack in the web, but according to the presentinvention, the momentthe tension on the web due to a diminution in'the-speed of the press ceases, the springs 25 and 26 will immediately act, causing the arm 27 rotatable with the shaft to leave the projection 28 on the brake drum and thereby overcome the inertia of the roll and diminish its speed, and this retarding action continues until the unwinding movement of the roll ceases upon the stopping of the press.

A roll controll'ng device constructed in accordance with the present invention, isrelatively simple in construction so that it may be made cheaply and is not liable to get out of order and in practice, it prevents an undue amount of slack between the roll and the press or other machine into which the Web is fed, so that when the press is started, there is no liability of the web snapping.

What I claim is'- 1. A web controller for rolls of paper and the like, involvin a shaft for the roll, a brake drum rotata le'thereon, and a device constantly connecting said shaft and drum during relative rotation thereof and acting to rewind the roll.

2. A controller of the character described, comprising ashaft for the roll, a tensioning device rotatable relatively thereto, a'spring connectin the shaft and tensioning device during re ative rotation of the latter and shaft, and positive driving devices forconnecting the tensionin dev1ceand shaft after the latter has rotate to tension the spring.

3. A controller of the character described embodying a shaft operable during the unwinding of the roll, a tensioning device adapted to resist rotation of the shaft, and a compensating medium forming a constant yielding connection between the shaft and the tensioning device.

. 4. A controller of the character described winding of the roll, a tensioning device for retarding rotation of the shaft, and a spring connecting the shaft and tensioning device and windable bya relative rotation of the shaft and tensionin' device, said spring normally acting to pro uce a relative rotation o the parts to rewind the roll.

6. A web controller for paper rolls com prising a shaft adapted to rotate with the roll during its unwinding, a brake device, and

a s ring operatively connecting the latter an the shaft during relative rotation of said parts and operable during the unwinding of the roll to rewind the latter.

7. A Web controller for aper rolls, comprising a shaft to receive t e roll and rota- 1 table therewith, a brake drum rotatably mounted on the shaft and having tensioning 9. A controller of the character described embodying a shaft rotatable during the winding motion of the roll, a brake drum having tensioning devices arranged to cooperate therewith, a compensating medium yieldably connecting the shaft and drum, and means for forming a positive driving connection between the shaft and drum after these parts have turned relatively through a predetermined angle.

10. A controller of the character described embodying a shaft operable during the unwinding movement of the roll, a'brakedrum loosely mounted on the shaft, tensioning devices arranged to cooperate with the drum, a spring having its ends connected respectively to the shaft and drum, and a sto for limiting the relative rotation of the sha t and drum.

11. A controller of the character described embodying a shaft operable during the unwinding of the roll, a drum revoluble on the shaft and having tensioning devices arranged to cooperate therewith, a s ring operatively connecting the shaft and rum, and a sto for limiting the relative rotation of the sha t and drum embodying an arm on one of the parts and a cooperating projection on the other part.

12. A drum of the character described, comprising a shaft, a brake drum rotatable thereon and havingtensioning devices cooperating therewith, a spiral spring forming an operative connection between the shaft and drum and permitting relative rotation thereof, and a stop for limiting the rotation of the shaft relatively to the drum comprising an arm on one of the arts, a projection on the other part, and a ufler for forming 'a yielding connection between the arm and embodying a shaft ada ,ted to serve as a su port for a paper roll, a rake drum rotatab e thereon, a s iral spring forming an operative connection etween the drum and the shaft,

and a stop for limiting the relative rotation of the shaft and drum.

14. A controller of the character described, comprising a shaft, a brake drum having a &

web journaled on the shaft, a pair of collars fixed to the shaltand cooperating with opposite sides of theweb, a palr of spiral springs oused Within the drum and having their 5 ends connectedrespectively to the latter and the collars and both operating to turn the shaft in a given direction relatively to'the I drum, and astop arranged to form a positive driving connection between theshaft and drum and to permit a limited degree of rota- 10 tion thereof.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FREDERICK w. ROLLAND, JR. Witnesses:

FREDERICK J. SPEOHT, LE ROY T. PALMER.

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