Engagement chain type device for operating forward and backward movement

An interlocking chain type forward and backward actuating device comprising a pair of interlocking chains, a driven body, and a chain guide plate, wherein

• the interlocking chains include hook-shaped inner tooth plates and hook-shaped outer tooth plates,
• the hook-shaped outer tooth plates arranged alternately with the inner tooth plates in a chain longitudinal direction,
• the inner tooth plates and the outer tooth plates coupled to one another in the chain longitudinal direction with coupling pins,
• the coupling pins extending through the inner tooth plates and the outer tooth plates in a chain width direction,
• at least one of the pair of interlocking chains being driven by a drive sprocket such that the interlocking chains become rigid with inner tooth plates of one interlocking chain are interlocked with inner tooth plates of the other interlocking chain, and outer tooth plates of the one interlocking chain are interlocked with outer tooth plates of the other interlocking chain, and such that the interlocking chains bifurcate from each other with the interlocked inner tooth plates being disengaged and the interlocked outer tooth plates being disengaged;
• the driven body is mounted to the pair of interlocking chains,
• the driven body is moved forward and backward according to forward and backward movement of the pair of interlocking chains,
• the interlocking chain type forward and backward actuating device comprising a chain guide plate and a chain locus regulating means;
• the chain guide plate comprising a first disengagement part guide and a second disengagement part guide, wherein the first disengagement part guide and the second disengagement part guide are operable to guide projecting portions of the coupling pins at a chain disengagement part where the interlocking chains are disengaged from each other,
• the chain guide plate provided on both sides of the pair of interlocking chains,
• the chain locus regulating means guides a rigid chain part,
• the chain locus regulating means comprises a chain locus regulating face,
• the chain locus regulating face operable to contact the rigid chain part where the interlocking chains are interlocked with each other to become rigid,
• the chain locus regulating means comprising a pair of chain locus regulating members;
• the chain locus regulating members bring the respective chain locus regulating faces into contact with outer plate faces from both sides of the rigid chain part in the chain width direction, the outer plate faces being included in a pair of respective outer tooth plates arranged outermost among the plurality of outer tooth plates included in the rigid chain part in the chain width direction,
• wherein the chain locus regulating members are operable to guide the interlocking chains when the chains are interlocked and rigid, and the disengagement part guides are operable to guide the interlocking chains with the chain locus regulating face at a chain disengagement position and/or when the chains are not interlocked;
• wherein the rigid chain part includes a first coupling pin and a second coupling pin, the first coupling pin extending through a first coupling pin passage in a rigid chain direction, and the second coupling pin extending through a second coupling pin passage in the rigid chain direction,
• wherein the coupling pin passages are formed at the chain guide plate with the first coupling pin passage communicating with the first guide for the chain disengagement part, and the second coupling, pin passage communicating with the second guide for the chain disengagement part, and
• the coupling pin passages have a passage width larger than a guide width of the disengagement part guides.