JPS58113066A - Paper feed roller for printing machine - Google Patents

Abstract

PURPOSE:To perfectly prevent the transfer of ink on printed paper to a paper feed roll surface, by integrally forming a metallic surface layer in small thickness along the peripheral surface of a rubbr made roll. CONSTITUTION:This paper feed roll 5 paired with rotary rolls to feed paper sheet by sheet consists of two pairs of rubber wheels 10... secured to a rotary shaft 9, and a thin metallic ring 11 is tightly fitted to a surface of each wheel 10 by means of vulcanized adhesion or the like. The ring 11 is formed by high rigid further anti-rust metal, for instance, stainless steel, nickel, chrome, phosphor bronze, aluminum alloy, etc., and fine and coarse surface work of roughness about 3-16mu is applied to the surface to display suitable frictional force for a surface of the paper. In this way, deriving from unaffinity of metal for ink, ink on the printed paper can be completely prevented from transfer to a surface of the roll 5.

Description

[Detailed description of the invention] The present invention relates to printing press paper feed rollers.

Currently, the offset two-sheet-fed (fixed size cut paper) printing machine is vJ1.
It has the basic mechanism as shown in the figure. To describe the printing method, a sheet of paper (7)' is fed one by one using the paper feed rotating roller 161 and the feed a-roller (5), and is placed on the plate cylinder +1+ on the surface of the blanket (3). The impression transferred from the paper is further transferred to the paper surface (7) and printed.

In the above mechanism, the feed roller ib! The paper sheets are moved vertically in front of the rotating roller (6), and when they collide with the rotating roller, the paper sheets are sandwiched between both sides and sent to the single-sheet printing machine. In addition, the paper gripping claw (8) housed in the impression cylinder (4)
receives the paper sheet and transfers it to the impression cylinder (4) and the blanket cylinder (2).
Draw between ゛.

Therefore, the feed roller frequently collides with the rotating roller during printing operations, so it is necessary to have a function to absorb the impact at that time and a surface friction force to ensure that the paper sheet is fed out. For this reason, rubber rollers have traditionally been used.

In addition, when printing second and subsequent colors using a similar printing device installed after the previous printing device, the ink on the paper surface may adhere to the surface of the feed roller, staining subsequent sheets of paper. Become.

Therefore, attempts have been made to use rubber, plastic, etc., which have low affinity for ink, as materials for the rollers, but these efforts have not yielded satisfactory results. In another method, a paper material with inorganic particles attached to the surface is wrapped around the surface of the feed roller, and a certain degree of effect has been obtained. As the particles are worn away, the wraps often need to contain paper (covering paper) and the wraps are rigid, so
Especially when the feed roller has a small diameter, the winding Z operation becomes extremely troublesome.

The present inventor focused on the fact that metal has no affinity for printing ink, and has conventionally been used as a feed roller,
It has been found that by providing a metal layer on the surface of a rubber roller that has good buffering performance, it is possible to solve the problem of paper stains caused by ink re-transfer to the surface of the paper feed roller.

The present invention is based on this knowledge, and its gist lies in applying a thin metal layer to the surface of a rubber roller. Embodiments of the present invention will now be described with reference to the drawings.

A perspective view, and FIG. 3 shows a sectional view thereof.

The feed roller i5) is composed of two pairs of rubber rings (10, 10i 10.10) fixed to the rotating shaft i9), and a thin metal ring (11, 11
The material of this metal ring, which is evenly fitted by means such as vulcanization adhesion, is a metal that is highly rigid and does not easily rust, such as stainless steel, nickel, chromium, and phosphor bronze. , aluminum alloy, etc. are preferable.

The surface of each metal ring (11) described above is subjected to micro-rough surface pressurization with a roughness of about 3 to 16 μm in order to exert an appropriate frictional force against the surface of the paper.

The rubber ring (10) is made of natural rubber, synthetic rubber (SBR, B
R.

IR, EPM, EPDM, CR, etc.), a rubber elastic body such as urethane elastomer, etc., in a hollow structure, but if desired, it can be formed into a wheel shape as shown in FIG. 4 to increase the shock absorption ability.

Note that the rubber ring (10) may be a foamed structure if necessary, but in this case, a low foaming ratio of about 1.1 to 10 times is preferable; if the foaming ratio is higher than this, the rubber ring (10) Since the displacement of the wheel becomes significant, the paper feeding function decreases.

As described above, the paper feed roller of the present invention has a beak structure in which the surface layer of the metal shaft is integrally formed on the surface of the rubber roller.
Due to the incompatibility of metal with ink, it is possible to completely prevent the ink on the printing paper from transferring to the surface of the paper feed roller, and therefore, the ink transfers to the printing paper. This prevents stains on the paper surface due to this.

Moreover, the appropriate frictional force on the surface of the metal ring works with the elasticity of the rubber ring to reliably feed the printed paper to the printing device for each sheet. It absorbs the impact force when the feed roller collides with the paper feed roller, thereby preventing damage to the J printing paper that gets caught between the two wheels, and also prevents the load on the bearing of the rotating shaft for the paper feed roller. It has many advantages such as being able to reduce

[Brief explanation of drawings]

Fig. fi1 is a schematic diagram illustrating the outline of an offset type sheet-fed printing press, Fig. 2 is a perspective view showing an example of the paper feed roller of the printing press of the present invention, and Fig. 3 is a diagram showing the roller shown in Fig. 2 along the axis. 4 is a partial sectional view similar to FIG. 3 showing a separate embodiment of the present invention. l: plate cylinder, 2 blank throat cylinder, 3: bran foot, 4
: Impression cylinder, 5: Feed roller (paper feed roller), 6
: Rotating roller, 7: Paper surface, 7: Paper industry, 8: Paper gripping claw・
9: Rotating shaft, 10.10': Rubber ring, ll: Metal ring. 'IA1 Figure 31!1

Claims (1)

[Claims] tll A paper feed roller for a printing machine, which is formed by integrally forming a thin metal surface layer along the circumferential surface of a rubber roller. (2' A printing press paper feed roller according to claim i11, wherein the surface of the metal surface layer is a slightly rough surface. (3) Claim 11, wherein the rubber portion is made of a polymer foam. ) Printing machine paper feed roller as described in item ).