US1736834A

US1736834A - Web-roll-control mechanism

Info

Publication number: US1736834A
Application number: US149331A
Authority: US
Inventors: Walter H Ogden
Original assignee: R Hoe and Co Inc
Current assignee: R Hoe and Co Inc
Priority date: 1926-11-19
Filing date: 1926-11-19
Publication date: 1929-11-26
Anticipated expiration: 1946-11-26

Description

w H. OGDEN WEB ROLL CONTROL MECHANISM Nov. 26, 1929 2 Sheets-Sheet Filed NOV 19. 1926 \NVENTOR fllllllm" mun 2;

Nmr. 26, 1929. w, H. OGDEN WEB ROLL CONTROL MECHANISM Filed Nov. 19. 1926 2 Sheets-Sheet INVE NTDR i ateirted Nov. 25, 132?) UNITED STATES PATENT orrica WALTER H. CGDEN, OF CLEVELAND, OHIO, ASSIGNOB TO B. HOE & 60., INC., 01' NEW YORK, N. Y., A CORPORATION OF NEW YORK WEB-BOLL-CONTROL MECHANISM Application filedNovemberlS, 1926. Serial No. 149,331.

This invention relates to certain improveas possible roughing up the surface of the ments in web controlling mechanism in which web and the consequent formation of lint,

friction devices are employed engagin with the surface of the roll for controlling t e rotation thereof.

In this class of mechanism, certain friction devices are provided which engage the surface of the unwinding web roll and act to control the rotationof the roll so that the web is fed into the press under the desired tension. These webrolls as they unwind, of course, decrease in size and, as they decrease in size, the pressure produced by the friction devices must vary, it being desirable to increase this pressure as the unwinding roll decreases i size and, where the roll is Inaterially decreased in size, it is desirable to cause a considerable increase in the pressure applied to the surface of the roll. Where, as is frequently the case in this class ofmechanism, the friction devices are in the form of belt's, it is desirable that the belts be of such size and so arranged as to engage the roll surface at points which form the margin spaces of the web after printing so as to prevent as far as possible the formation of lint, which is undesirable, in that it leads to bad printing.

It is the especial object of the present in vention to produce an improved arrangement of friction controlling devices for controlling the unwinding roll during its unwinding, and additional friction devices normally out of contact with the roll but which may be caused to engage with the roll when the roll has unwound to the point at which additional pressure on the roll is necessary or desirable, so that the increase in pressure on the roll surface maybe easily and readily obtained. a

A further object of the present invention is to arrange these additional friction devices so that they will engage the roll at the points which will form the margin spaces of the web after printing, so as to avoid as far "With these and other objects not specifically referred to, the invention consists in certain novel parts, arrangements and com- 5othe parts in a different position and the aux? iliary friction devices engaging the unwinding roll;

Figure 3 is a front view of the construction shown in Figs. 1 and 2 showing one arrange- 05 ment of the auxiliary friction. devices when these are arranged to engage the roll in the margin spaces; and

Figure 4 is a View similar to Fig. 3 showing a modified arrangement of the auxiliary friction devices.

Referring now to these drawings,the mechanism which has been selected to illustrate the invention is a roll changer capacitated to carry a running web roll and a spare web roll, the support for the roll being capable of being rotated, but itwill be understood that the invention, as to certain of its features, may be used in other relations and with other forms of web roll support.

in the partirularmechanism shown, there is provided a roll support including a pair of spaced arms 1, 2, each arm being provided with bearings 3, 4 preferably diametrically arranged for supporting the journals of a as running Web roll marked R and a spare web roll marked S. These arms 1, 2 are mounted so thatthey may have. a rotary movement, each arm being provided with a hub 5 mounted on a shaft 6 suitably supported in the maso I chine, there being driving mechanism for rotating this shaft, not shown, it being unnecessary for an understanding of the invention. The web W from the unwinding roll asses over the guide roll 7 to the press, not s own.

In accordance with the invention, this unwinding web is controlled by certain friction devices which, while they may assume various forms, are illustrated as being narrow belts or straps of any suitable material, such as canvas or leather, three

such straps

8, 9 and 10 being illustrated. These belts are arranged side by side and, in the best constructions, engage the roll surface at points which become the margin spaces after the web is printed, the arrangement shown being one for printing a four page wide product. These belts may be mounted and supported in Various ways. In the particular construction shown, the belts are free at one end, being carried over .a suitable roll 11, and having secured at their free ends weights 12, so that as the roll decreases in size the weights will drop and take up the slack'of the belts, thus keeping the belts under the desired tension.

The belts at their other ends are secured around a rod 13 mounted in lever arms 14 pivoted on a shaft 15, the other arms 16 of these levers being connected to a spring, not shown. These belts engage the roll surface and act to maintain a pressure on the roll while it is unwinding, thus providing the required tension for the unwinding web. Under some circumstances and particularly .when the roll materially decreases in size,

greater tension on the web is required. than can be conveniently given it with these belts and, in accordance with the invention, additional tension devices are provided which may be caused to engage the roll surface so as to produce'the required additional pressure. While these auxiliary or additional friction devices may be of various characters and while their engagement with the roll surface may be effected in various ways, in the preferred embodiment of the invention, these additional friction devices will be belts or straps which normally are positioned out of contact with the roll and are brought into contact with the roll by rotating the roll support so as to bring the roll into engagement with these additional belts. These belts, of course, may be provided in any desired number, and arranged as may be desired.

In the particular construction shown, referring first to Fig. 3, there are provided three of these additional straps, marked 17, 18 and 19, these being broken, as shown, for clarity of illustration, and these straps are arranged so as to bear against the

straps

8, 9, and 10, before referred to. Thus the additional friction devices lie over the regular friction belts and thus arein the margin spaces formed in the web after printing.

As shown, the

straps

8, 9 and 10 pass over tween the belts 8, .9 and 10, this construction being advantageous under some circumstances. These auxiliary belts, it will be observed, are narrow belts and, as they are in contact with the roll surface but a comparatively short time, their engagement with the roll surface does not rough up the surface sufficiently to cause an undesirable formation of lint.

The operation of the web controlling mechanism may be briefly described as follows: In the ordinary running position, as shown in Fig. 1, the

belts

8, 9 and 10 engage the surface of the running web roll R and the auxiliary belts are not brought into contact with the roll. When now the roll is materially decreased in size, the roll support is rotated so as to bring the running web R into the position shown in Fig. 2. When this has been done, it will be observed, that the auxiliary belts are brought into engagement with either the

belts

8, 9 and 10 or with the roll surface between the belts, depending on which arrangement is used, and the additional pressure is supplied to the running roll. It will be observed that the lap or the contact area of the auxiliary belts with the roll may be determined by the amount of rotary move ment given the roll support so that the pres sure of the belts on the roll may be nicely adjusted.

While the invention has been shown and described in its preferred form, it will be understood that various changes may be'made in the structure shown and described, and the invention, therefore, is not to be limited to the exact structure and arrangement of the parts shown.

What I claim is 1.. In a web roll controlling mechanism for printing machines, the combination of friction devices engaging the roll surface for controlling the tension of the unwinding roll, and auxiliary friction devices normally out of contact with the roll, but arranged for operative relation with the roll for supplying additional pressure to the surface of the roll that varies in circumference as the roll un winds.

2. In aweb roll controlling mechanism for printing machines, the combination of friction belts engaging the roll surface for controlling the tension of the unwinding roll, and auxiliary friction belts normal] out of contact with the roll, but arranged or operative relation with the roll for supplying additional pressure-to the unwinding roll.

3. In a web roll controlling mechanism-for printing machines, the combination of a movable web roll support, friction devices engaging the roll surface forcon'trolling the tension of the unwinding roll, and auxlliary friction devices normally out of contact with the roll and brought into operative relation therewith by moving the support for supplying additional pressure to the unwinding roll.

4. In a web roll controlling mechanism for printing machines, the combination of a rotary web roll support, friction belts engaging the roll surface for controllin of the unwinding roll, and auxi liary friction belts normally out of contact with the roll, but brought into operative relation with the roll surface b rotating the roll support, for supplying ad itional pressure to the unwindin" roll. a

In a web roll controlling mechanism for printing machines, the combination of friction devices engaging the roll surface for controlling the tension of the unwinding roll, and auxiliary friction devices normally out of contact with the roll, but arranged for engagement with the first named friction devices for supplying additional pressure to the unwinding roll.

the tension printing machines, 'the combination of friction devices engaging the roll surface for In hand.

y WALTER H. OGDEN.

6. In a web roll controlling mechanism for I.

printing machines, the combination of narrow friction belts engaging the roll surface for controlling the tension of the unwinding roll and arranged in the margin spaces of the web, and auxiliary friction belts normally out of contact with the roll, but arranged for engagement with the narrow belts for sup, plyling additional pressure tothe unwinding ro 7. In a web roll controlling mechanism for printing machines, the combination of friction belts engaging the roll surface for controlling the I tension of the unwinding roll, said belts being secured at one end and free at the other, weights at the free end of the belts, and auxiliary belts secured at one end and free at the other with weights at the free end normally out of contact with the roll, but

arranged for operative relation withthe roll for supplying additional pressure to the unwinding roll.

8. In a web roll controlling mechanism for printing machines, the combination of a ro tary web roll support, friction belts engaging vthe roll surface for controlling the tension of the unwinding roll, said belts being socured at one end and free at the other, and auxiliary belts secured at one end and free at the other normally out of contact with the roll, but arranged for operative relation with the roll by rotating the support for supplying additional pressure to the unwinding roll.

9. I a web roll controlling mechanism for