Security grille system comprising: a security grille for securing a passage at least partly, wherein the security grille is arranged to be brought from an extended state, in which the security grille can block the passage at least partly, into a retracted state, in which at least a part of the previously blocked part of the passage is unblocked, wherein the security grille comprises a multiplicity of bars, preferably substantially horizontally extending bars, connected by means of multiple elongated connecting elements for interconnecting respective bars, wherein the security grille system further comprises: a chain connected to the security grille, preferably a chain being flexible in only one dimension and/or being roller a chain; and at least one chain limiting member for at least locally limiting movement of the chain, e.g. in a direction in which said chain is flexible, such as to counteract that one or more links of the chain can be substantially moved away from a regular route along which the links move when the security grille is moved from its extended state to its retracted state or vice versa, characterized in that the security grille system further comprises a non-driven sprocket wheel positioned for facilitating that the chain moves straight into or out of the chain channel, said non-driven sprocket wheel being positioned between the driven sprocket wheel and the at least one chain limiting member, the system further comprising a restraining element for restraining the chain, said restraining element being formed by a part of a plate having a recess with a border corresponding with the chain engaging the driven sprocket wheel and the non-driven sprocket wheel. a security grille for securing a passage at least partly, wherein the security grille is arranged to be brought from an extended state, in which the security grille can block the passage at least partly, into a retracted state, in which at least a part of the previously blocked part of the passage is unblocked, wherein the security grille comprises a multiplicity of bars, preferably substantially horizontally extending bars, connected by means of multiple elongated connecting elements for interconnecting respective bars, wherein the security grille system further comprises: a chain connected to the security grille, preferably a chain being flexible in only one dimension and/or being roller a chain; and at least one chain limiting member for at least locally limiting movement of the chain, e.g. in a direction in which said chain is flexible, such as to counteract that one or more links of the chain can be substantially moved away from a regular route along which the links move when the security grille is moved from its extended state to its retracted state or vice versa, characterized in that the security grille system further comprises a non-driven sprocket wheel positioned for facilitating that the chain moves straight into or out of the chain channel, said non-driven sprocket wheel being positioned between the driven sprocket wheel and the at least one chain limiting member, the system further comprising a restraining element for restraining the chain, said restraining element being formed by a part of a plate having a recess with a border corresponding with the chain engaging the driven sprocket wheel and the non-driven sprocket wheel. a chain connected to the security grille, preferably a chain being flexible in only one dimension and/or being roller a chain; and at least one chain limiting member for at least locally limiting movement of the chain, e.g. in a direction in which said chain is flexible, such as to counteract that one or more links of the chain can be substantially moved away from a regular route along which the links move when the security grille is moved from its extended state to its retracted state or vice versa, characterized in that the security grille system further comprises a non-driven sprocket wheel positioned for facilitating that the chain moves straight into or out of the chain channel, said non-driven sprocket wheel being positioned between the driven sprocket wheel and the at least one chain limiting member, the system further comprising a restraining element for restraining the chain, said restraining element being formed by a part of a plate having a recess with a border corresponding with the chain engaging the driven sprocket wheel and the non-driven sprocket wheel.