A solution is proposed for sewing blocks of signatures in a bookbinding sewing machine. A corresponding method comprises, for each block of signatures, bringing a portion of each sewing thread through a corresponding free loop (by moving obliquely and then along an advancement direction of the blocks of signatures), blocking, cutting and pulling the sewing thread for tightening the free loop around the sewing thread being cut. A further aspect provides a corresponding sewing station. A further aspect provides a bookbinding sewing machine comprising this sewing station.

A method and an apparatus for the thread-stitching of folded signatures, for which individual folded signatures which are successively lined up along their flat sides are sewn together with at least one sewing needle and at least one hook needle to form a book block. Prior to penetrating the fold of the signature to be sewn from the inside to the outside and before penetrating the eyelet of the previously sewn signature, the hook needle is rotated in such a way around its longitudinal axis that its hook is positioned in a vertical symmetry axis of the eyelet, on a side of the hook needle that faces the previously sewn signature. The hook needle can be rotated for this at an optional angle () around its longitudinal axis and the hook can be positioned at an optional rotational position.

A method and an apparatus for the thread-stitching of folded signatures, for which individual folded signatures which are successively lined up along their flat sides are sewn together with at least one sewing needle and at least one hook needle to form a book block. Prior to penetrating the fold of the signature to be sewn from the inside to the outside and before penetrating the eyelet of the previously sewn signature, the hook needle is rotated in such a way around its longitudinal axis that its hook is positioned in a vertical symmetry axis of the eyelet, on a side of the hook needle that faces the previously sewn signature. The hook needle can be rotated for this at an optional angle () around its longitudinal axis and the hook can be positioned at an optional rotational position.

Disclosed is a stapler including: a body including a fixed plate provided on a top portion of one end thereof and formed with a needle insertion hole, and a lower thread supplier provided below the fixed plate to feed a lower thread through the needle insertion hole; and a presser which is connected to the other end of the body at one end thereof by a rotating shaft, includes a fastening needle installed to the other end to stitch an object, and penetrates the needle insertion hole together with an upper thread, in which the object is stitched with the upper thread and the lower thread when pressure is applied to the presser. Since the sheets of paper are bound with the thread, it is possible to prevent the paper from being discolored or crumbed.

Disclosed is a stapler including: a body including a fixed plate provided on a top portion of one end thereof and formed with a needle insertion hole, and a lower thread supplier provided below the fixed plate to feed a lower thread through the needle insertion hole; and a presser which is connected to the other end of the body at one end thereof by a rotating shaft, includes a fastening needle installed to the other end to stitch an object, and penetrates the needle insertion hole together with an upper thread, in which the object is stitched with the upper thread and the lower thread when pressure is applied to the presser. Since the sheets of paper are bound with the thread, it is possible to prevent the paper from being discolored or crumbed.

A solution is proposed for sewing book blocks (155). A corresponding method comprises, for each book block (155.sub.f), forming one or more stitchings (230,235) with corresponding threads (205) ending with corresponding free loops (305) on a last signature (115.sub.N) of the book block (155.sub.f). The threads (205) are brought in line with corresponding free loops (305) and thus through them along an advancement line of the signatures (115). The threads (205) are moved away from the free loops (305) by means of corresponding hooks (255), with the threads (205) sliding relative to the hooks (255) in this phase, thereby tightening each free loop (305) around its thread (205). After that, the threads (205) are cut. A corresponding bookbinding sewing machine (100) and a bookbinding plant are also proposed.

A solution is proposed for sewing book blocks (155). A corresponding method comprises, for each book block (155.sub.f), forming one or more stitchings (230,235) with corresponding threads (205) ending with corresponding free loops (305) on a last signature (115.sub.N) of the book block (155.sub.f). The threads (205) are brought in line with corresponding free loops (305) and thus through them along an advancement line of the signatures (115). The threads (205) are moved away from the free loops (305) by means of corresponding hooks (255), with the threads (205) sliding relative to the hooks (255) in this phase, thereby tightening each free loop (305) around its thread (205). After that, the threads (205) are cut. A corresponding bookbinding sewing machine (100) and a bookbinding plant are also proposed.

A solution is proposed for sewing blocks of signatures (115) in a bookbinding sewing machine (100). A corresponding method comprises, for each block of signatures (115), forming one or more stitchings (220, 225) between the signatures (115) of the block by corresponding sewing threads (215), each stitching (220, 225) comprising one or more plain stitches (220) and one or more looped stitches (225) concatenated to each other and ending with a free loop (240) on a last one (115N) of the signatures (115) of the block, bringing each sewing thread (215), downstream the corresponding plain stitches (220) along a formation direction thereof, to an intermediate position aligned with the corresponding free loop (240) along an advancement direction (235) of the blocks of signatures (115) during the sewing thereof, bringing a closing portion of each sewing thread (215) from the intermediate position through the corresponding free loop (240) along the advancement direction (235), the closing portion consisting of a portion of the sewing thread (215) downstream the corresponding plain stitches (220) along the formation direction thereof, blocking each sewing thread (215) at a gripping point comprised in the closing portion thereof by actuating a corresponding gripping device (250), cutting each sewing thread (215) downstream the gripping point thereof along the formation direction of the plain stitches (220), pulling each sewing thread (215) being cut by moving the corresponding gripping device (250), which blocks the sewing thread (215) being brought through the corresponding free loop (240), away from the corresponding free loop (240) thereby tightening the free loop (240) around the sewing thread (215) being cut, and releasing each sewing thread (215) being pulled by ceasing the actuation of the corresponding gripping device (250).

A method and an apparatus for the thread-stitching of folded signatures, for which individual folded signatures which are successively lined up along their flat sides are sewn together with at least one sewing needle and at least one hook needle to form a book block. Prior to penetrating the fold of the signature to be sewn from the inside to the outside and before penetrating the eyelet of the previously sewn signature, the hook needle is rotated in such a way around its longitudinal axis that its hook is positioned in a vertical symmetry axis of the eyelet, on a side of the hook needle that faces the previously sewn signature. The hook needle can be rotated for this at an optional angle (a) around its longitudinal axis and the hook can be positioned at an optional rotational position.

Disclosed is a stapler including: a body including a fixed plate provided on a top portion of one end thereof and formed with a needle insertion hole, and a lower thread supplier provided below the fixed plate to feed a lower thread through the needle insertion hole; and a presser which is connected to the other end of the body at one end thereof by a rotating shaft, and includes a fastening needle installed to the other end to stitch an object and penetrating the needle insertion hole together with an upper thread, in which the object is stitched with the upper thread and the lower thread when pressure is applied to the presser. Since the sheets of paper are bound with the thread, it is possible to prevent the paper from being discolored or crumbed.