US1200574A

US1200574A - Automatic tension device for web-rolls.

Info

Publication number: US1200574A
Application number: US79999813A
Authority: US
Inventors: Howard M Barber
Original assignee: Individual
Current assignee: CB Cottrell and Sons Co
Priority date: 1913-11-08
Filing date: 1913-11-08
Publication date: 1916-10-10
Anticipated expiration: 1933-10-10

Description

H. M. BARBER.

AUTOMATIC TENSION DEVICE FOR WEB ROLLS.

APPLICATION FILED NOV. 8, 1913.

1,200,574. Patented Oct. 10,1916.

3 SHEETSSHEET 1- negses lag fi itgr: t. f U I i 640/ :2 Q.

H. M. BARBER.

AUTOMATIC TENSION DEVICE FOR WEB ROLLS.

APPLICATION FILED Nov. 8. 1913.

1 00,574. Patented Oct. 10, 1916.

3 SHEETS-SHEET 2.

H. M. BARBER.

AUTOMATIC TENSlON DEVICE FOR WEB ROLLS.

APPLICATION FILED NOV. 8. 1913. 1,200,574. Patented Oct. 10,1916.

3 SHEETSSHEET 3.

UNITED STATES PATENT OFFICE.

HOWARD M. BARBER, OF STONINGTON, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO C. B. COTTRELL & SONS COMPANY, OF NEW YORK, N. Y., A CORPORATION OF 'IDELAHAIRE.

AUTOMATIC TENSION DEVICE FOR WEB-ROLLS.

Specification of Letters Patent.

Patented Oct. 10, 1916.-

T 0 all whom it may concern Be it known that I, HOWARD M. BARBER, a citizen of the United States, and resident of Stonington, in the county of New London and State of Connecticut, have invented a new and useful Improvement in Automatic Tension Devices for Veb-Rolls, of which the following is a specification.

The objectof this invention is to provide novel 11162111311601 gradually reducing the retarding frictionupon a web roll as the roll diminishes/in diameter, said means being arranged to act in successive steps and being controlled by} the diameter of the roll.

A further} object is to provide means under the control of the roll unwinding mechanism for automatically removing the retarding action of the tension device after.

the unwinding mechanism has been stopped.

The invention is particularly directed to a device for use in connection with the web roll of a printing press.

A practical embodiment of my invention is represented in the accompanying draw ings, in which Figure 1 represents the device in top plan, only so much of a web roll and its support being shown as will give a clear understanding of the relative positions and arrangement of the parts, Fig. 2 represents aview of the same in side elevation, certain of the parts being shown in section-to more clearly illustrate the parts within the same, Fig. 3 represents a view in end elevation of the parts, Fig. 4 is a detail view in side elevation, partly in section, showing the tension device in a position which it assumes when the webb roll is unwound, Fig. 5 is a detail section showing the means for controlling the movement of the brake lever fulcrum nuts, the parts being shown in one position, and Fig. 6 is a similar view with the parts shown in another position.

The frame is denoted by 1, which frame forms a bearing support for the shaft 2 of the web roll 3. The web is led from the web roll 3 to any suitable unwinding mechanism, such,for instance, as a (printing press.

The fluid pressure actuate brake is constructed, arranged and operated as follows A brake drum 4 is fixed to the shaft 2 of the web roll. Oppositely arranged brake lever connected to an outward extension 22 of a piston 23 by compensating hinge plates 24. This piston 23 works in a cylinder 23* and 1s provided with a piston rod 25 which extends through the inner end of the cylinder 23*. A spring 26, interposed between the inner end of the cylinder 23* and a collar 27, on the piston rod 25, serves to normally hold the piston 23 at the limit of its inward movement, and the brake shoes 5 and 6 released from their engagment with the drum 4 on the web roll shaft 2.

Fluid pressure" is supplied'to the cylinder 23* back of the piston 23 through a pipe 28 leading from a suitable source of fluid pressure supply, such as a reservoir 29, which pipe 28 has a valve 30 therein opened and closed by a governor 31, which governor is under the control of a web roll unwinding mechanism, in the present instance through the shaft 32 leading to the printing press, which shaft has a geared

connection

33, 34, with the vertical shaft 35. This shaft 35 has a geared connection 35*, 35**, with the governor 31. The parts are so arranged that when the governor is at rest the valve 30 will close communication from the reservoir 29 to the cylinder 23* and will open communication from the cylinder 23* to external atmosphere for releasing the pressure upon the back of the piston 23. When the governor is under speed the valve 30 will open communication from the reservoir to the cylinder 23* and will close communication between the cylinder 23* and external atmosphere.

The fulcrum nuts 11 and 12 are gradually moved toward each other as the diameter of the web-therefrom,

of the web roll 3. A spring 39 connecting the arm 36 with the main frame serves to hold the roller 38 pressed against the web roll. The shaft 37 has a geared connection tinuously in one .direction.

A rotary shaft 48 is mounted in suitable bearings 49, 50, and is provided with a geared connection 51, 52, with the shaft 15, which carries the fulcrum nuts 11 and 12 of the brake levers. This shaft 48 has fixed thereto a ratchet 53. A pawl 54 is carried by an escapement lever 55 loosely mounted on the shaft 48, which escapement lever is provided with a finger 56 arranged in alinement with the notches 47 in the escapement segment 46 and which is adapted to drop through said notches when opposite the same to permit a greater swinging movement of said lever 55. A rock lever 57 is also loosely mounted on the shaft 48 adjacent to the lever 55, which rock lever 57 is operated through a rod 58 from an eccentric 59 on the shaft 32.

The escapement lever 55 is provided with a laterally extended pin 60 projecting into the path of the lever 57 and so arranged that when the finger 56 of the escapement lever 55 is held raised between the notches 47, the lever 57 will not engage the said pin. When the finger 56 is opposite one of the notches 47, the escapement lever 55 will be raised every upward movement of the lever 57 by its engagement with the pin 60 and thus cause the pawl 54 by its engagement with the ratchet 53 to rotate the shaft 48 a short distance, such distance being controlled by the width of the notch 47. This rotary movement of the shaft 48 will, in turn, impart a rotary movement to the shaft 15 thus drawing the fulcrum nuts of the brake levers slightly toward each other and lessening thereby the effect of the pressure fluid actuated piston upon the brake shoes 5 and 6. The notches 47 are, preferably graduated in width growing gradually wider toward the rear end of the segment so as to give the desired amount of movement to the shaft 48 to insure the proper step by step reduction of the frictional resistance of the brake shoes 5 and 6 upon the drum 4 of the web roll. By referring to the position of the toggle lever in Fig. 2 and its position in Fig. 4, it will be seen that with a constant fluid pressure the effect on the brake levers is much less when the web roll is unwound. When the press or other web unwinding mechanism is stopped, the stopping of the governor will release the fluid pressure upon'the back of the piston 23 and the brake shoes 5 and 6 will be released from their engagement with the drum 4, by the action of the spring 26 upon the piston rod 25. The compensating hinge plates 24 interposed between the piston 23 and the toggle lever, will insure an even adjustment of the pressure by both of the brake shoes 5 and 6.

The shaft 48 may be provided with a handle 61 for ermitting the manual adjustment of the fulcrum nuts 11 and 12 for insuring the proper frictional engagement of the brake shoes 5 and 6 with the web roll drum 4.

From the above description it will be seen that I am enabled to obtain an automatic seen that this gradual decreasing of the friction is obtained in successive steps, the

time of which steps may be gradually increased as the roll grows smaller. It will also be seen that the governor for the brake actuating fluid serves as a means for releasing the brake when the unwinding mechanism is stopped and for applying the brake after the unwinding mechanism has been started and has reached a predetermined speed. This permits the web roll to be easily started in its unwinding move ment before the brake is applied for retarding the unwinding movement thereof.

What I claim is:

1. An automatic tension for web rolls including a fluid pressure operated brake and means controlled by the decreasing diameter of the roll for reducing the frictional resistance of the brake to the unwinding of the roll.

2. An automatic tension for web rolls including a. brake, means controlled by the decreasing diameter of the roll for reducing the frictional resistance of the brake to the unwinding of the roll, and means adapted to be controlled by a roll unwinding mechanism for releasing and applying the brake.

3. An automatic tension for web rolls including a fluid pressure operated brake, means controlled by the decreasing diameter of the roll for reducing the frictional resistance of the brake to the unwinding of the roll and means adapted to be controlled by a roll unwinding mechanism for releas ing and applying the brake actuating fluid.

4. An automatic tension for web rolls including a brake comprising two brake levers and means controlled by the decreasing diameter of the roll for moving the levers as a whole toward each other to reduce the frictional resistance of the brake to the unwinding of the roll.

1 5. An automatic tension for web rolls. including a fluid pressure operated brake comprising two brake levers and means controlled by the decreasing diameter of the roll for moving the levers bodily toward each other to reduce the frictional resistance of the brake to the unwinding of the roll.

6. An automatic tension for web rolls including a fluid pressure operated brake comprising two brake levers, a cylinder, a piston working therein connected to the brake levers and means controlled by the decreasing diameter of the roll for moving the levers bodily toward each other to reduce the frictional resistance of the brake to the unwinding'of the roll.

7. An automatic tension for web rolls including a fluid pressure operated brake comprising two brake levers, a cylinder, a piston working therein, a toggle lever connecting the brake levers and piston and means controlled by the decreasing diameter of the roll for moving the levers bodily toward each other to reduce the frictional resistance of the brake to the unwinding of the roll.

8. An automatic tension for web rolls including a fluid pressure operated brake comprising two brake levers, means controlled by the decreasing diameter of the roll for moving the levers bodily toward each other to reduce the frictional resistance of the brake to the unwinding of the roll and means adapted to be controlled by a roll unwinding mechanism for releasing and applying the brake actuating fluid.

9. An automatic tension for web rolls including a fluid pressure operated brake comprising two brake levers, a cylinder, a piston working therein connected to the brake levers, means controlled by the decreasing diameter of the roll for moving the levers bodily toward each other to reduce the frictional resistance of the brake to the unwinding of the roll and means adapted to be controlled by a roll unwinding mecha nism for releasing and applying the brake actuating fluid.

10. An automatic tension for web rolls including a fluid pressure operated brake comprising two brake levers, a cylinder, a piston working therein, atoggle lever connecting the brake levers and piston, means controlled by the decreasing diameter of the roll for moving the levers bodily toward each other to reduce the frictional resistance of the brake to the unwinding of the roll and means adapted to be controlled by a roll unwinding mechanism for releasing and applying the brake actuating fluid.

11. An automatic tension for web rolls including a brake comprising a brake lever and means controlled by the decreasing diameter of the roll for moving the lever as a .whole in a direction to reduce the frictional resistance of the brake to the unwind ing of the roll.

12. An automatic tension for web rolls including a fluid pressure operated brake comprising a brake lever and means controlled by the decreasing diameter of the roll for moving the lever in a direction to reduce the frictional resistance of the brake to the unwinding of the roll.

13. An automatic tension for web rolls including a fluid pressure operated brake comprising a brake lever, a cylinder, a piston working therein connected to the brake lever and means controlled by the decreasing diameter of the roll for moving the lever in a direction to reduce the frictional resistanfie of the brake to the unwinding of the ro 14. An automatic tension for web rolls including a fluid pressure operated brake comprising a brake lever, means controlled by the decreasing diameter of the roll for moving the lever in a direction to reduce the frictional resistance of the brake to the unwinding of the roll, and means adapted to be controlled by a'roll unwinding mechanism for releasing and applying the brake actuating fluid.

15. An automatic tension for web rolls including a fluid pressure operated brake comprising a brake lever, a cylinder, a piston working therein connected to the brake lever, means controlled by the decreasing diameter of the roll for moving the lever in a direction to reduce the frictlonal resistance of the brake to the unwinding of the roll and means adapted to be controlled by a roll unwinding mechanism for releasing and applying the brake actuating fluid.

16. An automatic tension for web rolls including a brake comprising two brake levers, an oppositely threaded screw, fulcrum nuts for the levers carried thereby and an escapement device controlled by the decreasing diameter of the roll for causing the brake lever fulcrum nuts to be moved toward each other for reducing the frictional resistance of the brake to the unwinding of the roll.

17 An automatic tension for web rolls including a brake comprising two brake levers, an oppositely threaded screw, fulcrum nuts for the levers carried thereby, and an escapement device controlled by the decreas ing diameter of the roll for causing the brake lever fulcrum nuts to be moved, step by step, toward each other for reducing the frictional resistance of the brake to the unwinding of the roll, in successive steps.

18. An automatic tension for web rolls including a fluid pressure operated brake comprising two brake levers, an oppositely threaded screw, fulcrum nuts for the levers carried thereby, and an escapement device controlled by the decreasing diameter of the roll for causing the brake lever fulcrum nuts to be moved toward each other for reducing the frictional resistance of the brake to the unwinding of the roll.

19. An automatic tension for web rolls including a fluid pressure operated brake comprising two .brake levers, an oppositely threaded screw. fulcrum nuts for the levers carried thereby, an escapement device interposed between said screw andthe shaft of a roll unwinding mechanism and controlled by the decreasing diameter of the roll for causing the brake lever fulcrum nuts to be moved toward each other for reducing the frictional resistance of the brake to the unwinding of the roll, and means controlled by said shaft for releasing and applying the brake actuating fluid.

20. An automatic tension for Web rolls including a fluid pressure operated brake, means controlled by the decreasing diameter of the roll for reducing the frictional resistance of the brake to the unwinding of the roll, and means adapted to be controlled by a roll unwinding mechanism for releasing the brake actuating pressure fluid when the unwinding mechanism stops and for applying the brake actuating pressure fluid after the unwinding mechanism has been started and has reached a predetermined speed.

21. An automatic tension for web rolls including a fluid pressure operated brake, means controlled-by the decreasing diameter of the roll for reducing the frictional resistance of the brake to the unwinding of the roll, in successive steps, and means adapted to be controlled by a roll unwinding mechanism for releasing the brake actuating pressure fluid when the unwinding mechanism stops and for applying the brake actuating pressure fluid after the unwinding mechanism has been started and has reached a predetermined speed.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this twentyseventh day of October, 1913.

HOWARD M. BARBER. Witnesses:

A. R. STILLMAN, E. M. GRANT.