Patent Application
20250083466
The present invention relates to a stapling unit for binding bunch of sheets to form a book and more particularly it relates to stapling unit with an improved stitching head drive apparatus for quick & quality operation and also reduction in rejection of staple pins.
Books, including magazines, are composed of signatures which simply folded sheets are bearing the printed matter. The signature may present pages of the usual kind, or it may be a special size insert. The individual signatures which compose the book are fed from corresponding hoppers or so-called pockets and the signatures for each book are eventually collected one a top another, or one aside another as the case may be, on a conveyor and are transported by the conveyor to a station in the machine where the signatures are joined into a book by stitching with staples or by gluing, depending on how the book is bound.
The books presented to the binding machine have variable thicknesses. Therefore, the binding machine must be capable of handling the variable book thicknesses. If, for example, the books are being stitched, the stitcher heads must apply proper compression to the saddle of the books. If there is too much compression, there will be a bulge in the backbone of the stitched book while if there is too little compression, the staple will be loose.
Conventionally as shown in
The main drawback associated with the conventional stitcher drive mechanism is that the movement as per eccentric path leads to delay in staple pin operation timing and affecting staple pining quality. This technique does not lend itself to high speed production (on the order of five books per second). Also, this method produces staples of improper length.
In order to overcome the above said problem of conventional eccentric method, stapling mechanism needs an innovative solution which overcomes all above problem and maintains the functionality of the machine which will lead to easy and quick in operation with minimum ejection of staple pining into book as well as improvement in the quality of staple pining.
The main object of the present invention is to provide a stapling unit with an improved stitching head drive apparatus which will provide controllable movement of stitching head.
Another object of the present invention is to provide a stapling unit with an improved stitching head drive apparatus which will minimize the rejection of the staple pining.
Further object of the present invention is to provide a stapling unit with an improved stitching head drive apparatus which will result in improved cycle time of machine.
Another object of the present invention is to provide a stapling unit with an improved stitching head drive apparatus which will result in quick and quality operation of staple pining.
One more object of the present invention is to provide a stapling unit with an improved stitching head drive apparatus that is free from the drawbacks of the conventional eccentric mechanism.
Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.
The present invention relates to a stapling unit with an improved stitching head drive apparatus. In the present invention, a bunch sensor senses the absence of the bunch of sheets and send the signal to the PLC which actuates a lever operating device. The lever operating device open 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 movement of the pivot lever on pivot and the driving lever will not transfer the motion to the shaft which is responsible to drive the stitching head. Thus, the present invention provides controllable movement of the stitching head resulting in improved cycle time of machine and minimum rejection.
Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the construction and arrangement of parts illustrated in the accompany drawings. The invention is capable of other embodiments, as depicted in different figures as described above and of being practiced or carried out in a variety of ways. It is to be understood that the phraseology and terminology employed herein is for the purpose of description and not of limitation.
The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.
It is to be also understood that the term “comprises” and grammatical equivalents thereof are used herein to mean that other components, ingredients, steps, etc. are optionally present. For example, an article “comprising” (or “which comprises”) components A, B, and C can consist of (i.e., contain only) components A, B, and C, or can contain not only components A, B, and C but also contain one or more other components.
Now, according to exemplary embodiment as illustrated in
Said staple wire (not shown) is preferably made of metal. Said wire spools (not shown) are rotated with respect to an elongated spindle being longitudinally and centrally extended through the wire spools (not shown) when the wire is pulled. Said wires are fed vertically and parallelly downward from respective wire spools by passing through their corresponding guide channel (not shown).
Further, the stitching head (5) is perpendicularly applied on the bunch of sheets along the conveying path of the sheets so that the bunch of sheets is stapled from above. Each of the stitching head (5) comprises a staple-forming and driving mechanism for advancing said wire (not shown) there-through along the longitudinal axis thereof and performing stapling operation upon the pulled wire (not shown) received from respective wire pulling roller (not shown). The sheets to be stitched are positioned beneath the stitching head (5).
Now as shown in
Now as shown in
As shown in
In the operation for driving the stitching head (5) in accordance with the present invention, the bunch of the sheets travel on the bunch conveyor and being stopped by mechanical stopper at stapling unit. Initially, the bunch of sheets is positioned below the stitching head (5). In such circumstances, the toggle lever (8) engages the driving lever (9) and the pivot lever (10). The CAM drive (12) operates the pivot lever (10) through the link (2). Now, due to the coupling of both, the pivot lever (10) and the driving lever (9) through the toggle lever (8), the driving lever (9) operates the shaft (4) which lowers down the stitching head (5) through the stitching head lever (14) and the connecting link (16).
When the stitching head (5) lower downs, penetration of staple pin in bunch of sheets is obtained. Such movement of the stitching head (5) will result in accurate penetration of staple pin in the bunch of sheets. Also at the same time, the clincher assembly (not shown) lifts upward through a CAM (not shown). This will result in perfect closing of staple pin on bunch of sheets.
Now, in circumstances of absence of the bunch of sheets, the bunch sensor (15) will send the signal to the PLC which actuates the lever operating device (A). Then the lever operating device (A) will push the toggle release lever (7) to open the toggle lever (8).
Now immediately when the toggle lever (8) gets open, the pivot lever (10) will no longer remain in contact with the driving lever (9) and hence, the pivot lever (10) will move freely on pivot as usual. But due to disengagement of the toggle lever (8), the motion will not transfer to the shaft (4) through the driving lever (9) which is responsible to drive the stitching head (5). In such condition, the stitching head (5) will not move downward. Hence, no pining action will take place.
This mechanism of the stitching head drive apparatus perform easy and quick operation of staple pining into the book. This system can able to control the movement of the stitching head (5) by designing rise and dwell of
CAM as per requirement of stopping, pining and movement of book in precise manner. By synchronizing all operation through CAM design, cycle time of machine has improved. The staple pining operation becomes quick and rejection is minimized which results in improved quality of end product.
Wearing of the stitching head bottom with book also avoided which resulted into improved stitching head life.
The invention has been explained in relation to specific embodiment. It is inferred that the foregoing description is only illustrative of the present invention and it is not intended that the invention be limited or restrictive thereto. Many other specific embodiments of the present invention will be apparent to one skilled in the art from the foregoing disclosure. All substitution, alterations and modification of the present invention which come within the scope of the following claims are to which the present invention is readily susceptible without departing from the spirit of the invention. The scope of the invention should therefore be determined not with reference to the above description but should be determined with reference to appended claims along with full scope of equivalents to which such claims are entitled.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202121059471 | Dec 2021 | IN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IN2022/051096 | 12/19/2022 | WO |
