US2018319A - Braking mechanism for paper rolls - Google Patents

Description

Oct. 22', 1935- H. H. RAYMOND El AL 2,018,319

BRAKING MECHANISM FOR PAPER ROLLS Filed June 1, 1933 Homce H/Paymond Jofinsfone Vance Patented Oct. 22, 1935 UNITED STATES PATENT orries Vance, New Britain, Conn, assignors, by direct and mesne assignments, of one-half to Johnstone Works, New Britain,

Connecticut Vance and one-half to The Stanley C'onn., a corporation of Application June 1, 1933, Serial No. 673,890 11 Claims. (01. 192-2) The present invention relates to brake mechanisms for automatically stopping the rotation of the rolls of paper when the machine through which the paper is passed is stopped. As an instance of a use to which the present invention may be applied, reference may be had to a newspaper printing press, it being understood, however, that our improvements may be applied to other machines, such as paper making machines.

In machines of this sort, the paper is ordinarily pulled along by the printing or other rolls from a heavy roll of paper stock, and when the press is stopped the paper roll, due to its momentum, would keep on rotating, and excess paper would become unwound unless the paper roll were stopped at about the same time the other rolls were stopped. If the paper were permitted to unwind and become slack, it might become caught in parts of the roll, resulting in a loss of paper, delay in operation, and possible damage to parts of the machine.

The aim of the present invention is to provide an improved arrangement having various features of novelty and advantage and by means of which the roll or rolls of paper with which the machine is equipped is stopped rotating in a very effective and yet simple manner when the machine is stopped.

A further aim of the invention is to provide a brake mechanism of this sort which is simple In construction, relatively economical in manufacture and installation, and which is effective in operation in that it willstop rotation of the roll or rolls of paper in proper timed relation to the stoppage of the machine and thus prevent overrunning of the roll of paper or breaking of the web or webs.

Other objects will be in part obvious, and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the appended claims.

In the accompanying drawing, wherein is shown, for illustrative purposes, one embodiment which the present invention may take,

The figure is a more or less diagrammatic layout of a brake mechanism constructed in accordance with the present invention.

Referring to the drawing in detail, A denotes a paper roll supporting shaft such, for example, as one of the paper supporting roll shafts of a p t p s t e moun ng of the shaft, the

manner in which it is driven, and its relation to the printing rolls not being illustrated as it is understood that the specific construction of the machine to which our improved brake mechanism is applied is immaterial so far as the present 5 invention is concerned. The shaft A is equipped with a brake device B which may include the usual brake drum ID with which are adapted to cooperate brake shoes ll carried by holders i2 which may be pivoted, as at l3. Pivoted to the 10 upper end of one of the holders is a threaded rod or screw l4 which passes freely through the upper end of the other holder, there being a knurled nut IS on the screw which, when tightened up,

is adapted to draw the brake shoes up against the 15 drum. As is usual, the nut I5 is screwed up somewhat in order to produce a tension on the web when the press is running.

Referring now to the improvements of the present invention, 20 designates a weight or 20 equivalent power means which, when released, is adapted to automatically apply the brake B in order to stop the shaft A, together with the roll of paper thereon. In the present illustrative disclosure, this weight is carried by one end of 5 a cable 2| passing over a pulley 22, the other end of the cable being connected to one end of a lever 23 pivoted, as at 24. The other end of the lever is connected by a cable 25, a spring 26, a

screw 21, and a fulcrum member 28 to the paper 3Qv roll brake B. This member 28 is interposed between the nut I5 and the adjacent brake shoe holder i2. The screw 21 passes freely through the upper end of the member 28, and behind the member 28 and on the screw 21 is an adjusting 5 nut 29. When the machine is operating, the operator adjusts the nut 15 to secure the desired web tension and then adjusts the nut 29 until the cable 25 is taut. The spring 26 insures an even pull although the shaft A may be somewhat ec- 4.0 centric. It also equalize s the pull where the brakes for several paper rolls are attached by individual cables to the lever. When the cable 25 is pulled tov the left, referring to the drawing, (and which is done when the weight 29 is released, as hereinafter described more in detail) the member 28 will fulcrum, as at 3!), on the upper end of the right-hand holder [2, thereby tending to separate that brake holder and the nut i5, with the result that a lever action is set up tending to press the brake shoes tighter against the drum ii).

For the purpose of raising the weight to store up power therein, and in order to release the weightfrom raised position and thereby apply the brake, there is provided a cam C cooperating with the lever 23 and which cam is operated by drive means such as a suitable motor 53 controlled in part by the stopping mechanism for the machine, and in part by neans driven in timed relation 'to the cam itself. In the present illustrated disclosure, this cam C is in the form of two relatively adjustable sections or parts 35 and 35 carried by a shaft 36. The sections may be secured in relatively adjusted position by a bolt 31 carried by one of the sections and accommodated by an arcuate slot38 in the other one. It will be observed from the drawing that the cam, which rotates in the. direction of the arrow, has a low concentric portion '39, a gradual rise portion 45, a high concentric portion 4|, and an abrupt drop portion 42. Fixed to the lever 23 is a hardened block 43 adapted to rest upon the cam section 35 when the parts are in the position shown in the figure. Alongside of this block is a roller 44 which engages the cam :and takes the load of the weight except at the beginning and ending of the cycle of movement of the cam.

Referring now to the drive means for the cam C, there is fixed to the shaft 35 a worm wheel 41 meshing with the'worm 28 carried by a shaft 49 having a'wor-m' wheel 59 meshing with the worm :51 ion the shaft 52 of a small motor For the'purpose of stopping the rotation of the "rotor and-shaft 512 when the current is shut off .of the motor and thus prevent it from overrun ning, .a suitable brake device is provided which may take the 'form of a brake drum 54 fixed to :the shart 52; a strap '55 passing about the brake drum and-connected to a plunger 56 of a solenoid 51; and a tension spring 58 anchored at one end and connected at its lower end to the plunger. The spring 58 normally pulls upwardly on the plunger and strap 55 so as to draw the strap tight about the drum 54.

Starting of the small motor 53 and thereby initiation of movement of the cam C is controlled through suitable elctrical connections by means associated with the mechanism for stopping the printing or other rolls wi h which the machine may be equipped. Usually, the motors for driving printing presses and similar machines are equipped with a solenoid brake which may be similar to the previously described brake shown in connection with the small motor 53 therefore, this brake mechanism is not shown in detail. It is represented in the drawing more or less diagrammatically by a solenoid as having a plunger 51 comparable to the plunger 55 and operated in like manner. The coil of the solenoid 55, and themotor (not shown) for the printing press "may .be'controlled by a suitable switch 62 conveniently placed on the press.

Also, the breaking of .the current through the solenoid and the press motor may be automatically efifected in the eventa web of paper, as it passes through the press, should break. In any event, when the motor comprising the press drive is startedthe solenoid 63 is energized and the brake shoes are withdrawn; Stopping of the motor deenergizes the solenoid. L

, For the purpose of stopping the motor 53 when the cam C has completed a cycle of movement, (that when the cam has reached the position shown in the drawing) there is provided a cam 65 which controls a limit switch designated generally by the letter D, the cam 65 being driven in timed relation to the cam C. In the present instance, the cam 65 is secured to the shaft 36 which carries the cam C. The limit switch may be of any suitable construction, it being conventionally shown as having a pivoted arm 66 and a roller 6? engaging the cam The arm 85 carries a contact 58 which is adapted. to cooperate with the fixed contact 69. A spring 10' urges the switch arm to closed position.

The electrical connections, through which the motor 53 is controlled, may best be explained in connection with a description of the operation of the mechanism. Connected in parallel with the solenoid '55 of the press drive is a coil of a relay E and a coil 10 of a second relay F. The armature H of the relay E constitutes a switch arm adapted to cooperate with a fixed contact 12. The relay F has a .double throw switch arm 13 adapted to alternately engage contacts 74 and 75. The switch arm "53 is drawn to the full line position shown in the drawing by the coil iii and to the dotted lineposition by a coil I6. When the press is running, the solenoid 68 is energized and current is passing'through the relay E and the coil l0 so that the switch rarm 'H is raised and no current passes through the contact 1-2. When the switch 5?. is opened, the brake solenoid of the press motor is deenergized, which deenergizes the coil of relay E allowing armature *ll to fall, making contact with the terminal 12. Current will then pass from the line Ll through contact '12, switch arm or contact '55, arm 13 and wire 18 to the motor 53 and solenoid 51.. The wire 79 returns the current to line L2 thus completing the circuit. The small motor '53 starts and the small solenoid 57 is energized with the result that the plunger 56 is pulled down against the spring 58 which ioos ens the "band 2011 the brake drum 54. Starting of the motor starts rotation of the cam C in a counterclockwise direction and almost immediately thereafter the high portion of. the 'cam'is withdrawn from the block S permitting that block to .fall to the dotted line position :shown in the drawing and thus releasing the weight 20. The full force of the weight is transmitted through the lever 23 and the cable '25 to the l'ulcrum member 28 "thus applying the brake B associated with the shaft which carries the roll of paper. Further, when the cam C starts to rotate, the limit switch cam .rotates therewith and is moved from the position shown in the drawing, with the result that the limit switch .13 is closed by the spring 70. When this limit switch is closed, the current will flow from the line Ll through the switch D, wire 80, wire 8|, coil l'S and wire 82 connected to the line L2. Thus, the coil is energized with the result that'the arm 73 is pulled over to the dotted line position shown in the drawing. The arm 13 now engages with the contact 14, the transfer of the arm from the contact 15 to the contact 14 being almost 'instantaneousso that operation of the motor 53 is not affected. limit switch as before,wire 80, contact 14, switch arm 73 and wire 78 and through the motor 53 and solenoid 51 back to the line L2 so that operation of the motor 53 is continued. The paper roll brake remains "applied until the rise portion 45 of the cam C picks up the roller 44, thereby liiiting the left-hand end of the lever 23 and raising the weight '25 with the result that power is stored in the weight for the next operation. The cam C continues to rotate until it has reached the end of its cycle, that is, the position shown in the drawing and, at this time, the cam 65 will open the limit switch thus breaking the current armature ll, wire 71,

The current will now pass through they through the motor 53 and the solenoid 51, with the result that the motor will stop and the brake, associated with that motor, will be applied. The parts are now in the position shown in the drawing, the switch arm 13 being in the dotted line position. When the press drive motor is again started, the relay E is energized so as to raise the switch arm or armature 1| and the coil 10 of the relay F is energized, with the result that the switch arm 13 is drawn to the full line position shown in the figure. The mechanism is now in position to make another cycle when the press is again stopped. It will be observed that, at the beginning of the cycle of movement of the cam, the block S is close to the rear edge of the high portion 4| of the cam so that when the cam starts to rotate, the weight is immediately released and the full force of the weight is almost instantly efiective to apply the brake B. The advantage of providing the cam C with the adjust able section 35' is that it has been found by experience advisable to release the paper roll brake a fraction of, a second before the press stops, for otherwise the web may be broken. A possible explanation for this behavior is that the friction of the paper roll brake shoes is greater at rest than in motion; that is, the static friction exceeds the kinetic friction, and just as the roll comes to rest the braking force may rise very suddenly to a point where it is too great for the web to stand.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description orshown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

We claim as our invention:

1. In combination, a paper roll brake device for stopping the roll, power means for applying said brake device, means for releasing said power means to thereby apply said brake, drive means for said releasing means, means for initiating operation of said drive means when the machine in which the paper roll is incorporated is stopped, and means associated with said releasing means for stopping said drive means when said releasingmeans has completed its cycle of movement.

2. In combination, a paper roll brake device for stopping the roll, power means for applying said brake device, cam means for storing power in said power means and then releasing it, drive means for said cam means, means for initiating operation of said drive means when the machine is stopped, and means driven in timed relation to said cam means for stopping said drive means.

3. In combination, a paper roll brake device for stopping the roll, a weight for applying said brake device, means for raising said weight and releasing it from raised position, a drive motor for said weight raising and releasing means, means for initiating operation of said drive means when the'machine in which the paper roll is incorporated is stopped, and means driven in timed relation to said weight raising and releasing means for stopping said drive motor.

4. In combination, a paper roll brake device for stopping the roll, power means for applying said brake device, means for releasing said power means'and for releasing said brake device, an electric motor for driving said releasing'means, means for initiating operation of said electric motor when'the machine in which the paper roll is incorporated is stopped, and means driven in timed relation to said releasing means for breaking the connection through the motor at the end of the cycle of movement of said releasing means. i

5. In combination, a paper roll brake device for stopping the roll, power means for applying said brake device, a rotary cam for controlling said power means, an electric motor for driving said cam, means for initiating operation of said motor when the machine in which the paper roll is incorporated is stopped, and means for stopping said drive means and comprising a switch electrically connected to said motor and a cam controlling said switch and driven in timed relation to said first cam.

6. In combination, a paper roll brake device for stopping the roll, a weight for applying said brake device, a rotary cam adapted torelease said weight to apply the brake, then raise it to store power therein and to stop with the weight in raised position, means for driving said cam, and means for automatically controlling said drive means.

'7. In combination, a paper roll brake device for stopping the roll, a lever connected thereto, a weight connected to said lever and adapted when released to turn the lever to apply the brake device, a rotary cam cooperating with said lever and having a drop portion adapted to permit the weight to fall and a rise portion adapted to raise the weight, means for rotating said cam, means for initiating operation of said drive means when the machine in which the paper roll is incorporated is stopped, and means driven in timed relation to said cam for stopping said drive means.

8. In combination, a paper roll brake device for stopping the roll, a lever connected thereto, a weight connected to said lever and adapted when released to turn the lever to apply the brake device, a rotary cam cooperating with said lever and having a drop portion adapted to permit the weight to fall and a rise portion adapted to raise the weight, said rise portion being angularly adjustable with respect to said drop portion, means for driving the cam, and means for automatically starting and stopping said driving means.

9. In combination, a paper roll brake device for stopping the roll "and including a pair of brake shoe holders adapted to be moved towards each other to apply the shoes, a fulcrum member adapted to draw said holders towards each other, a pivoted lever, a connection between said lever and fulcrum member, a weight suspended from said lever and adapted when released to apply said brake device, a rotary cam cooperating with said lever and adapted when started to release the weight and also adapted to raise the weight, drive means for said cam, and controlling means for said drive means.

10. In combination, a paper roll brake device for stopping the roll, power means for applying said brake device, means for controlling said power means, an electric motor'for driving said controlling means, a brake device for said motor and including a solenoid, means for energizing said motor and solenoid when the machine in 4 2,018,319 which said paper roll is incorporated is stopped, solenoid operated switch associated with said and means driven in timed relation to said confirst mentioned means and adapted when the trolling means for de-energizing said motor and machine is stopped to close the current through solenoid when said controlling means has comsaid motor, means for tie-energizing said motor pleted a cycle of movement. and including a switch and a member driven in 5 11. In combination, a paper roll brake device timed relation to said controlling means for for stopping the roll, means for stopping the opening said switch, and a relay device associmachine in which saidrpaper roll is incorporated, ated with said switches and through which said power means for applying said brake device, switches control said motor.

. means for controlling said power means, an elec- HORACE H. RAYMOND. 10

tric motor for driving said controlling means, a JOHNSTONE VANCE.

Images