US2080249A - Gripper mechanism for printing presses - Google Patents

Description

y 1937- H. M. BARBER 2,080,249

GRIPPER MECHANISM FOR PRINTING PRESSES Filed April 22, 1936 2 Sheets-Sheet 1 INVENTOR fl/p BY f

ATTORNEYS May 11, 1937. H. M. BARBER GRIPPER MECHANISM FOR PRINTING PRESS'EB Filed April 22, 1956 2 Sheets-Sheet 2 INVENTO ATTORNEYS UNITED STATES PATENT OFFICE GRIPPE-R MECHANISM FOR PRINTING PRESSES I Howard M. Barber, Pawcatuck, Conn, assignor to C. B. Cottrell & Sons Company, Westerly, 11.1., a corporation of Delaware Application April '22, 1936, Serial No. 75,677

.14 Claims. (Cl. 101-409) In gripper mechanism utilizing a'spring pressed shaft 5, which shaft is located in the usual gripper tumbler cam on the end of the gripper shaft recess 6 extending along the periphery of the for holding the grippers in their open or closed carrier, the longitudinal walls of which recess position there is a tendency of the gripper shaft are denoted by 1 and 8. These gripper fingers 5 to twist, thus causing an uneven pressure of the 4 are swung by the rocking of their shaft, from gripper fingers upon the sheet when the grippers an open position within the recess 6 to a closed are closed. This is particularly true where the position on the pads 9 carried by the longitudigr-ipper shaft is of considerable length. This nally disposed bar I0. arrangement also tends to cause a hammering One end of the rock shaft 5 projects beyond 10 action of the grippers and the consequent noise the corresponding end of the rotary carrier l 10 and wear, due to all of the pressure being applied and it is there provided with a spring pressed to thegrippers at one end of the shaft whether tumbler cam H Whose r ves I2 and 13 are the'g-rippers be open or closed. located in position to be engaged by the cam The object of my invention is to eliminate this operating pins l4 and I5 carried by one of the 15. distortionof the gripper shaft, the uneven presside frames 3 for rocking the tumbler cam and 15 sure of the grippers "and the noisy action of thereby the gripper shaft, to open and close the the grippers, by providing auxiliary spring means grippers. The tumbler cam springs 16 and I1 acting upon the gripper shaft at one or more are arranged as usual to hold the grippers in points between the ends of the shaft to intheir open or closed position. suitable stops [8 crease the pressure of the grippers upon their and I9 on the end of the rotary carrier are 20 20 sheets whenthe grippers are closed, said grippers located in position to engage the tumbler cam being freed from said auxiliary spring pressure H to limit the rocking movement of the rock when they are open. By this arrangement the shaft 5. tumbler Spring not be made powerfulin One or more, in the present instance two, its action that the grippers will slap and become auxiliary spring devices are shown for causing 2 noisy, as is al Where vthe ntire pressure is the grippers to exert the required added presi e e d Don the pp y the Said tumbler sure on the sheet when the grippers are closed,

spring. each of which auxiliary pressure devices is con- A Practical embodiment of invention i strueted,arranged and operated as follows: ep nt d in the c p y drawings, in The rock shaft 5 has fast thereon within 30 which the gripper recess 6 an arm 20 which carries 1 represents a plalliview of a rotary sheet a stud or roller 2| located in position to be carrier-embodyin my improved gr pp mechaswung into and out of contact with a cam surnisrn'; face 22 of a spring pressed lever 23 as thegrip- 2 represents a cross Section of the Same, pers are closed and opened. As the grippers are 3; t ke in 1 of the line of closing, the stud or roller 21 will depress the looking in the direction of the arrows the movlever 23 against the tension of t spring 24, able parts being Shown in full lines in the p051 thus causing the grippers to exert additional tiOIIS they 1 3 when the grippers'are closed pressure on the sheet when the grippers are andin dotted lines in the positions they occupy closed. It will be understood that the cam sur- 40 when the grippers are open; face 22 of the lever 23 is so shaped that no pres- Fig. 3 represents a detail cross section, taken Sure whatever is exerted on the grippers by the in the plane of the line III-III of Fig.1, look- Spring 2 when the grippers are open. A Stop mg in the direction of the altyqws the movable bar 25 serves todimit the outward movement parts being shown in the posltlons hey occupy of the cam lever when the grippers are closed; and It will also be understood that while two of ction with the Fig 4 fia 02 1221 3: they occupy when these auxiliary grlpper pressure devices are shown movable parts m p herein, one or more of said devices may be used the grippers are Open' to suit different requirements.

arrier I is herein repre- 5O ser fit efi 21 iin gi esiion cylinder of a rotar The arrangement hereinabove described perto be operated with less noise ress, the rotary carrier shaft 2 being m1ts the grippers uit l o l nounted in the side frames 3 of the and wear and yet have suflicient pressure when ISJIGSS y closed on the sheet to hold it firmly and evenly on The gripper fingers 4 are fixed on their rock the carrier. When the grippers are open they will be entirely freed from this auxiliary pressure.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, and hence I do not intend to be limited to the particular embodiment herein shown and described, but

VJhat I claim is:

1. A rotary sheet carrier, grippers carried thereby, a tumbler, a spring acting on the tumbler for holding the grippers open or closed, and means for separately exerting additional pressure on the grippers when closed.

2. A rotary sheet carrier, grippers carried thereby, a spring pressed tumbler for holding the grippers open or closed, and means for separately exerting additional pressure on the grippers when closed, said grippers when open being freed from said additional pressure.

. 3. A rotary sheet carrier, grippers carried thereby, a tumbler, a spring acting on the tumbler at one end of the carrier for holding the grippers open or closed, and means located between the ends of the carrier for separately exerting additional pressure on the grippers when closed.

4. A rotary sheet carrier, grippers carried thereby, a spring pressed tumbler at one end of the carrier for holding the grippers open or closed, and means located between the ends of the carrier for separately exerting additional pressure on the grippers when closed, said grippers when open being freed from said additional pressure.

5. A rotary sheet carrier, grippers carried there- :by, a tumbler, a spring acting on the tumbler at one end of the carrier for holding the grippers open or closed, and one or more devices located between the ends of the carrier for separately exerting additional pressure on the grippers when closed.

6. A rotary sheet carrier, grippers carried thereby, a spring pressed tumbler at one end of the carrier for holding the grippers ,open or closed, and one or more devices located between the ends of the carrier for separately exerting additional pressure on the grippers when closed, said grippers when open being freed from said additional pressure.

7. A rotary sheet carrier, 2. rock shaft mounted therein, grippers carried by the rock shaft, a tumbler on one end of the said shaft, a spring acting on the tumbler for holding the grippers open or closed, and means acting on said gripper shaft between its ends for separately exerting additional pressure on the grippers when closed.

8. A rotary sheet carrier, a rock shaft mounted therein, grippers carried by the rock shaft, a spring pressed tumbler acting on one end of the said shaft for holding the grippers open or closed,

on the tumbler for holding the grippers open or closed, and one or more devices acting on the gripper shaft between its ends for separately exerting additional pressure on the grippers when closed.

10. A rotary sheet carrier, a rock shaft mounted therein, grippers carried by the rock shaft, a spring pressed tumbler acting on one end of said shaft for holding the grippers open or closed, and one or more devices acting on the gripper shaft between its ends for separately exerting additional pressure on the grippers when closed, said grippers when open being freed from said additional pressure.

11. A rotary sheet carrier, a rock shaft mounted therein, grippers carried by the rock shaft, a

spring pressed tumbler acting on one end of the shaft to hold the grippers open or closed, a device acting on the gripper shaft between its ends for separately exerting additional pressure on the grippers when closed, said device comprising a spring pressed lever having a cam surface, and an arm on the gripper shaft arranged to be swung into contact with said cam surface as the grippers are closed and out of contact with said cam surface when the grippers are open.

12. A rotary sheet carrier, a rock shaft mounted therein, grippers carried by the rock shaft, a spring pressed tumbler acting on one end of the shaft to hold the grippers open or closed, a device acting on the gripper shaft between its ends for separately exerting additional pressure on the grippers when closed, said grippers being freed of the additional pressure when open, said device comprising a spring pressed lever having a cam surface, and an arm on the gripper shaft arranged ,spring pressed tumbler acting on one end of the shaft to hold the grippers open or closed, a plurality of devices acting on the gripper shaft between its ends for separately exerting additional pressure on the grippers when closed, each of said devices comprising a spring pressed lever having a cam surface, and an arm on the gripper shaft arranged to be swung into contact with said cam surface as the grippers are closed and out of contact with said cam surface when the grippers are open.

14. A rotary sheet carrier, a rock shaft mounted therein,grippers carried by the rock shaft,aspring pressed tumbler acting on one end of the shaft to hold the grippers open or closed, a plurality of devices acting on the gripper shaft between its ends for separately exerting additional pressure on the grippers when closed, said grippers being freed of the additional pressure when open, each of said devices comprising a spring pressed lever having a cam surface, and an arm on the gripper shaft arranged to be swung into contact with said cam surface as the grippers are closed and out of contact with said cam surface when the grippers are open.

HOWARD M. BARBER.

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