The present invention relates to a servo controlled stitching apparatus that comprises a servo controlled wire pulling means (4) for pulling the required length of wire for stitching bunch of paper sheets. Said pulling means (4) comprises pulling roller (11) having wire retaining groove (11a) for guiding wire extending from the spool (2) towards the stitching head (1). It also comprises pressure roller (13) that rotates against pulling roller (11) for pulling the wire (16) from the spool (2). The length of wire to be pulled is predefined in the controller means which is communicated with the servo motor (7) that rotates said rollers (11, 13) until the predetermined length of wire is pulled. The stitching head (1) utilize the wire (16) of pulled length without rotating the spool itself to avoid pulling load and to apply even stapling on the bunch of paper sheets.

The present invention relates to a servo controlled stitching apparatus that comprises a servo controlled wire pulling means (4) for pulling the required length of wire for stitching bunch of paper sheets. Said pulling means (4) comprises pulling roller (11) having wire retaining groove (11a) for guiding wire extending from the spool (2) towards the stitching head (1). It also comprises pressure roller (13) that rotates against pulling roller (11) for pulling the wire (16) from the spool (2). The length of wire to be pulled is predefined in the controller means which is communicated with the servo motor (7) that rotates said rollers (11, 13) until the predetermined length of wire is pulled. The stitching head (1) utilize the wire (16) of pulled length without rotating the spool itself to avoid pulling load and to apply even stapling on the bunch of paper sheets.

The present invention relates to a servo controlled stitching apparatus that comprises a servo controlled wire pulling means (4) for pulling the required length of wire for stitching bunch of paper sheets. Said pulling means (4) comprises pulling roller (11) having wire retaining groove (11a) for guiding wire extending from the spool (2) towards the stitching head (1). It also comprises pressure roller (13) that rotates against pulling roller (11) for pulling the wire (16) from the spool (2). The length of wire to be pulled is predefined in the controller means which is communicated with the servo motor (7) that rotates said rollers (11, 13) until the predetermined length of wire is pulled. The stitching head (1) utilize the wire (16) of pulled length without rotating the spool itself to avoid pulling load and to apply even stapling on the bunch of paper sheets.

The present invention relates to a servo controlled stitching apparatus that comprises a servo controlled wire pulling means (4) for pulling the required length of wire for stitching bunch of paper sheets. Said pulling means (4) comprises pulling roller (11) having wire retaining groove (11a) for guiding wire extending from the spool (2) towards the stitching head (1). It also comprises pressure roller (13) that rotates against pulling roller (11) for pulling the wire (16) from the spool (2). The length of wire to be pulled is predefined in the controller means which is communicated with the servo motor (7) that rotates said rollers (11, 13) until the predetermined length of wire is pulled. The stitching head (1) utilize the wire (16) of pulled length without rotating the spool itself to avoid pulling load and to apply even stapling on the bunch of paper sheets.

The present invention relates to wire stitching apparatus with missing staple pin detection mechanism. In present invention, the stitching head is connected with a negative terminal of the power supply box and the positive terminal of the power supply box is supplied to the relay. The negative terminal of the relay is supplied to the lower clincher. During stapling, the stitching head comes in contact with the clincher that completes the circuit due to metallic contact between the stitching head and the clincher. Thus, an electrical signal is provided to the relay from the power supply box. Hence, the relay gets electrical signal only when the pinning is done. Now, in absence of metallic contact between head and the clincher, the relay will not get signal. In such situation, the PLC generate fault to detect the missing staple pin.

The present invention relates to wire stitching apparatus with missing staple pin detection mechanism. In present invention, the stitching head is connected with a negative terminal of the power supply box and the positive terminal of the power supply box is supplied to the relay. The negative terminal of the relay is supplied to the lower clincher. During stapling, the stitching head comes in contact with the clincher that completes the circuit due to metallic contact between the stitching head and the clincher. Thus, an electrical signal is provided to the relay from the power supply box. Hence, the relay gets electrical signal only when the pinning is done. Now, in absence of metallic contact between head and the clincher, the relay will not get signal. In such situation, the PLC generate fault to detect the missing staple pin.

A stapling unit with an improved stitching head drive apparatus includes a bunch sensor that senses the absence of the bunch of sheets and send a signal to the PLC, which actuates a lever operating device. The lever operating device opens the toggle lever by pushing the toggle release lever to disengage the driving lever from the pivot lever. The disengagement of the toggle lever with the pivot lever and the driving lever results in free pivotal movement of the pivot lever and the driving lever will not transfer the motion to the shaft which is responsible to drive the stitching head. Thus, the controllable movement of the stitching head results in improved cycle time of machine and minimum rejection.

A stapling unit with an improved stitching head drive apparatus includes a bunch sensor that senses the absence of the bunch of sheets and send a signal to the PLC, which actuates a lever operating device. The lever operating device opens the toggle lever by pushing the toggle release lever to disengage the driving lever from the pivot lever. The disengagement of the toggle lever with the pivot lever and the driving lever results in free pivotal movement of the pivot lever and the driving lever will not transfer the motion to the shaft which is responsible to drive the stitching head. Thus, the controllable movement of the stitching head results in improved cycle time of machine and minimum rejection.

The present invention relates to wire stitching apparatus with missing staple pin detection mechanism. In present invention, the stitching head is connected with a negative terminal of the power supply box and the positive terminal of the power supply box is supplied to the relay. The negative terminal of the relay is supplied to the lower clincher. During stapling, the stitching head comes in contact with the clincher that completes the circuit due to metallic contact between the stitching head and the clincher. Thus, an electrical signal is provided to the relay from the power supply box. Hence, the relay gets electrical signal only when the pinning is done. Now, in absence of metallic contact between head and the clincher, the relay will not get signal. In such situation, the PLC generate fault to detect the missing staple pin.

The present invention relates to wire stitching apparatus with missing staple pin detection mechanism. In present invention, the stitching head is connected with a negative terminal of the power supply box and the positive terminal of the power supply box is supplied to the relay. The negative terminal of the relay is supplied to the lower clincher. During stapling, the stitching head comes in contact with the clincher that completes the circuit due to metallic contact between the stitching head and the clincher. Thus, an electrical signal is provided to the relay from the power supply box. Hence, the relay gets electrical signal only when the pinning is done. Now, in absence of metallic contact between head and the clincher, the relay will not get signal. In such situation, the PLC generate fault to detect the missing staple pin.