JP4357041B2 - Bookbinding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bookbinding machine, and more particularly to prevention of bookbinding machine damage.
[0002]
[Prior art]
For example, a bookbinding machine that performs so-called wireless binding, in which signatures are collected in the order of pages by a collating machine, glued on the back of a booklet (booklet), and a cover is attached to the back of the glued booklet is bound. ing. As shown in FIG. 6, such a bookbinding machine is a booklet transport in which a clamper 4 that clamps a booklet at predetermined intervals is arranged and fixed on a chain 3 that circulates around a drive sprocket 1 and a driven sprocket 2. Means, and a milling section that performs processing for aligning the back of a booklet (not shown) along the circulation path of the chain 3, a pasting section that covers the back and throat of the booklet after milling, and a cover A bookbinding processing unit such as a nipping (back molding) unit for aligning the cover sheet supplied from the supply device and the booklet and pasting the cover sheet to the pasting part of the booklet is arranged. Reference numeral 5 shown in FIG. 6 is a guide support rail for the clamper 4 installed along the chain 3.
[0003]
The clamper 4 includes a fixed clamp plate 4a whose position is fixed to the chain 3 and a movable clamp plate 4b that is driven by a driving force (not shown). The movable clamp plate 4b is supported by drive shafts 4c and 4d at both ends. The booklet inserted between the fixed clamp plate 4a and the movable clamp plate 4b at the starting position A of the circular movement is sandwiched between the clamp plates, and passes through the bookbinding processing section along with the circular movement of the chain 3. Then, the booklet that has been bound at the end position B of the circular movement is released and ejected. A clamper 4 that is sequentially emptied with the circular movement of the chain 3 is positioned at the starting position A of the circular movement, and a booklet that is sequentially subjected to bookbinding is supplied to the clamper 4.
[0004]
[Problems to be solved by the invention]
By the way, in such a bookbinding machine, it is necessary to synchronize the operation of each machine of the bookbinding processing unit and the movement of the clamper 4, and in order to simplify the synchronization, a motor with one large output is used. The drive sprocket 1 for moving the clamper 4 and each machine of the bookbinding processing unit are driven. However, since a motor with a large output is used, if an accident occurs that locks the movement of the clamper 4 due to a clogged booklet or the like while the clamper 4 is moving, the clamper and its drive mechanism, colliding parts, etc. There is a problem that the devices of each part of the bookbinding machine are damaged.
[0005]
This problem can be solved by causing the drive sprocket to slide relative to the rotary drive shaft when an overload occurs in the drive sprocket. However, if the drive sprocket slides with respect to the rotation drive shaft, synchronization with each machine of the bookbinding processing unit is disturbed, and this disorder needs to be corrected to resume the bookbinding process. Otherwise, for example, the glue position on the back side of the booklet is different, the cover sticking position is different, or the glue on the back surface adheres to the nip plate to contaminate the nip plate. However, this correction involves rotating the drive sprocket appropriately and returning the clamper to the original position, but this alignment is quite troublesome and requires a lot of time.
[0006]
The present invention has been made in view of such problems, and when an overload occurs that locks the movement of the clamper with a simple mechanism, the movement force of the clamper is reduced immediately, and the components of each part of the bookbinding machine are damaged. An object of the present invention is to provide a bookbinding machine capable of preventing and simultaneously returning a clamper to a synchronized position quickly and easily.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, a rotary drive shaft, a drive sprocket connected to the rotary drive shaft and rotated, a driven sprocket, the drive sprocket and the driven sprocket are wound around the bookbinding processing section. In the bookbinding machine, the drive sprocket includes: a chain that moves the bookbinding processing unit with a plurality of clampers disposed on the chain at predetermined intervals, and a booklet sequentially sandwiched between the plurality of clampers. An engagement protrusion protruding from the surface is formed on the drive sprocket so as to be rotatably supported by the rotation drive shaft, a rotation plate is fixed to the rotation drive shaft, and the engagement protrusion is mounted on the rotation plate. An engagement lever that is engaged by an urging force is pivotally supported, and the rotation of the rotation drive shaft is transmitted to the drive sprocket by the engagement of the engagement lever and the engagement protrusion. It is characterized in.
[0008]
The engagement Ru inventions to claim 2, in engagement Ru inventions in claim 1, a proximity sensor for detecting the teeth of the drive sprocket is provided, the detected driving sprockets an abnormality of the drive sprocket by a signal of the proximity sensor the rotation of the rotary drive shaft for transmitting rotation you characterized by being stopped.
[0009]
The engagement Ru inventions to claim 3, in engagement Ru inventions in claim 1 or claim 2, the number of teeth of the drive sprocket is an integer multiple of the chain number of links between the clamper, the engagement projections formed on the drive sprocket The position is formed at a position corresponding to the number of teeth of the number of chain links between the clampers of the drive sprocket, and the invention according to claim 4 is the invention according to claim 3, wherein The number is four and the number of engaging levers is two .
[0010]
In the present invention, an engagement protrusion is formed on the drive sprocket that drives the clamper and is rotatably supported on the rotary drive shaft, while the rotary drive shaft is provided with a rotary plate that rotates integrally with the rotary drive shaft. The plate has, for example, an engagement recess that engages with the engagement protrusion at one end, and the other end is connected to the other end of the spring that is fixed to the rotation plate, and its central portion stands on the rotation plate. An engagement lever rotatably supported on the shaft is provided, and the engagement recess of the engagement lever is pressed against the engagement protrusion by the biasing force of the spring, and the rotation of the rotation drive shaft is transmitted to the drive sprocket. Thus, when an overload is applied to the drive sprocket, the engagement recess and the engagement protrusion are disengaged against the spring biasing force, and the rotational force of the rotary drive shaft is not transmitted to the drive sprocket.
[0011]
As a result, when an overload that locks the movement of the clamper occurs, the moving force of the clamper can be reduced immediately, and damage to each part of the bookbinding machine can be prevented. In addition, since the engagement protrusion is in a position synchronized with the clamper, even if a positional deviation occurs between the rotation drive shaft and the drive sprocket, the rotation drive shaft or the drive sprocket is appropriately rotated in the normal or reverse direction to form the engagement recess. By simply engaging the engaging protrusion, the clamper can be quickly and easily returned to the original synchronized position.
[0012]
In addition, if a proximity sensor that detects the teeth of the drive sprocket is provided, the idle rotation of the rotation drive shaft can be detected quickly, and the rotation drive shaft and the drive sprocket can be detected in the event of an overload that locks the movement of the clamper. It is possible to reduce the positional deviation between them and to return to the original position where the clamper is synchronized more quickly. Further, when a plurality of engaging levers and engaging protrusions are provided, the engaging force can be increased as a whole.
[0013]
Furthermore, the number of teeth of the drive sprocket is an integral multiple of the number of chain links between the clampers (the length of the clamper plus the distance to the next clamper, the pitch of the clamper) and the number of engagement protrusions formed on the drive sprocket. If the position is formed for each number of teeth of the number of chain links between the clamps of the drive sprocket, that is, for example, at a position corresponding to the reference position of the clamper, when a plurality of engagement protrusions are provided, the rotation drive shaft and the drive sprocket Even if a misalignment occurs between them, the clamper can be quickly and easily returned to the synchronized normal position only by engaging the engaging protrusion and the engaging recess at the closest position.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 is a plan view showing the entire clamper conveying means of the bookbinding machine according to the embodiment of the present invention, FIG. 2 is an enlarged plan view of the drive sprocket portion (clamper is omitted) of FIG. 1, and FIG. 4 is a cross-sectional view of the drive sprocket portion, FIG. 4 is a plan view showing the connection between the drive sprocket and the rotary drive shaft, and FIG. 5 is a cross-sectional view of the connection portion between the drive sprocket and the rotary drive shaft shown in FIG. The same parts as those of the clamper conveying means shown in FIG.
[0015]
In FIG. 1, 7 is a drive sprocket, 7a is a tooth of the drive sprocket 7, 7b is a positioning pin (engagement protrusion) raised from the surface of the drive sprocket 7, 8 is a circular rotating plate, and 8a is a rotating plate. 8 is a shaft that protrudes from the surface, 8b is a spring fixing pin that protrudes from the surface of the rotating plate 8, 8c is a stopper pin that protrudes from the surface of the rotating plate 8, 9 is an engaging lever, 9a Is an engaging recess, 10 is a rotary drive shaft, 11 is a spring, and 12 is a proximity sensor that detects the movement of the teeth 7 a of the drive sprocket 7.
[0016]
The number of teeth 7a formed on the outer periphery of the drive sprocket 7 is the number of links of the chain 3 between the clampers 4 (the length obtained by adding the length of the clamper 4 and the interval between the clampers 4 and the pitch of the clamper) P. Is four times in this embodiment, and four engagement protrusions 7b are provided at equal intervals in the circumferential direction. That is, the engagement protrusion 7 b is set at a position corresponding to the number of teeth of the chain link between the clampers 4 of the drive sprocket 7, in other words, at a position corresponding to the same position as each clamper 4.
[0017]
The rotary plate 8 is provided with shafts 8a at two diametrical ends, and a central portion of the engaging lever 9 is rotatably fitted to each of the shafts 8a. The engaging lever 9 pivotally supported by the rotating plate 8 is formed with an engaging recess 9a that is removably fitted into the engaging protrusion 7b of the drive sprocket 7 at one end, and the other end 9b has one end at the rotating plate 8. The end portion of the compression spring 11 fixed to the spring fixing pin 8b formed on is attached. As a result, the engaging lever 9 is urged so that the end portion where the engaging recess 9 a is formed protrudes outward in the diameter direction of the rotating plate 8. In order to limit the protrusion, a stopper pin 8c is provided on the rotary plate 8.
[0018]
As shown in FIG. 3, the rotary drive shaft 10 has a bevel gear 18 fixed to one end, and the bevel gear 18 meshes with a bevel gear 17 fixed to the rotary shaft 16. The rotating shaft 16 is connected to the output joint 15 of the speed reducer 14, and the speed reducer 14 appropriately reduces the rotational speed of the motor 13 that collectively drives the devices of each part of the bookbinding machine and outputs the reduced speed. That is, the rotation drive shaft 10 is rotated by the rotation of the motor 13 being transmitted. The drive sprocket 7 is rotatably supported by the rotary drive shaft 10, and the rotary plate 8 is fixedly supported by the rotary drive shaft 10 at a position close to the drive sprocket 7, and is integrated with the rotary drive shaft 10. Rotate to.
[0019]
The engagement protrusion 7 b of the drive sprocket 7 is located at a close position along the outer peripheral edge of the rotating plate 8, and is usually supported by the engaging lever 9 that is pivotally supported by the rotating plate 8 and biased by the spring force of the spring 11. Engaging with the recess 9a, the rotation of the rotary plate 8 accompanying the rotation of the rotary drive shaft 10 is transmitted to the drive sprocket 7 by this engagement, and the drive sprocket 7 rotates. The rotation of the drive sprocket 7 causes the chain 3 hung on the drive sprocket 7 to move around, and the clamper 4 fixed to the chain 3 moves through the bookbinding processing section.
[0020]
When an overload that locks the movement of the clamper 4 occurs due to a clogged booklet or the like during the movement of the clamper 4, the engagement between the engagement protrusion 7 b of the drive sprocket 7 and the engagement lever 9 against the biasing force of the spring 11. Even if the engagement with the joint recess 9a is released and the rotating plate 8 continues to rotate, the drive sprocket 7 stops immediately. In this case, in this embodiment, a proximity sensor 12 that detects the movement of the teeth 7a of the drive sprocket 7 by a pulse interval or the like is provided, and this proximity sensor detects a deviation in rotational speed of the drive sprocket 7 with respect to the rotating plate 8. When the deviation occurs, the motor 13 is stopped.
[0021]
Even if the engagement protrusion 7b and the engagement recess 9a are disengaged by this stop, the distance between the engagement protrusion 7b and the engagement recess 9a can be made extremely small, and the return to the original state can be made quickly and easily. Since the motor 13 is stopped, the safety of removing the cause of the overload is ensured. Providing such a proximity sensor can increase the speed, but when an abnormality of the drive sprocket 7 is sensed, the motor 13 may be stopped by manually operating a switch.
[0022]
When the engagement protrusion 7b and the engagement recess 9a are disengaged, the return is performed by appropriately rotating the rotary drive shaft 10 or the drive sprocket 7 forward or backward to engage the engagement recess 9a and the engagement protrusion 7b. To do. If the engaging recess 9a and the engaging protrusion 7b are engaged, the clamper 4 can be returned to the synchronized normal position, and the bookbinding process can be continued without requiring any special correction work.
[0023]
In the above embodiment, the engagement protrusion 7b is provided at a position corresponding to the number of teeth of the chain link between the clampers 4 of the drive sprocket 7. However, even if there is only one engagement protrusion 7b. Alternatively, a plurality may be provided at arbitrary positions so that the engaged protrusions that have been engaged can be confirmed. Further, the number of teeth of the drive sprocket 7 and the number of engaging levers 9 are also arbitrary.
[0024]
【The invention's effect】
As described above in detail, according to the present invention, when an overload is generated in the drive sprocket that drives the clamper, the rotational force does not act on the drive sprocket, thereby preventing damage due to collision of each part of the bookbinding machine. can do. In addition, due to the lock of the drive sprocket and the idle rotation of the rotary drive shaft, the clamper can be quickly and easily returned to the synchronized position even if the clamper is displaced from the synchronized position. Furthermore, a mechanism for this is provided with an engagement protrusion on the drive sprocket, and the rotation of the rotation drive shaft is transmitted to the drive sprocket by the detachable engagement between the engagement protrusion and the engagement lever provided on the rotating plate. It is obtained with a simple and simple configuration.
[Brief description of the drawings]
FIG. 1 is a plan view showing an entire clamper conveying means of a bookbinding machine according to an embodiment of the present invention.
FIG. 2 is an enlarged plan view of a drive sprocket portion (clamper is omitted) of FIG. 1;
FIG. 3 is a cross-sectional view of the drive sprocket portion of FIG.
FIG. 4 is a plan view showing the connection between the drive sprocket and the rotary drive shaft according to the embodiment of the present invention.
5 is a cross-sectional view of a connecting portion between the drive sprocket and the rotary drive shaft shown in FIG.
FIG. 6 is a plan view showing an entire clamper conveying means of a conventional bookbinding machine.
[Explanation of symbols]
2 Driven sprocket 3 Chain 4 Clamper 7 Drive sprocket 7a Drive sprocket teeth 7b Positioning pin (engagement protrusion)
8 Rotating plate 8a Shaft 8b Spring fixing pin 8c Stopper pin 9 Engaging lever 9a Engaging recess 10 Rotating drive shaft 11 Spring 12 Proximity sensor 13 Motor 14 Reducer 15 Joint 16 Rotating shafts 17 and 18 Bevel gear

Claims (4)

A rotation drive shaft; a drive sprocket coupled to the rotation drive shaft; a driven sprocket; a chain wound around the drive sprocket and the driven sprocket; A bookbinding machine having a plurality of clampers arranged at intervals, and moving the bookbinding processing unit while sequentially holding a booklet between the plurality of clampers, and the drive sprocket projects from the surface to the drive sprocket An engaging lever that forms an engaging projection that is rotatably supported on the rotary drive shaft, and that fixes a rotary plate to the rotary drive shaft, and engages the rotary plate with the engaging projection by a biasing force. The bookbinding machine is characterized in that the rotation of the rotary drive shaft is transmitted to the drive sprocket by the engagement of the engagement lever and the engagement protrusion. The bookbinding machine according to claim 1, wherein a proximity sensor that detects teeth of the drive sprocket is provided, an abnormality of the drive sprocket is detected by a signal of the proximity sensor, and rotation of the rotary drive shaft is stopped. The number of teeth of the drive sprocket is an integral multiple of the number of chain links between clampers, and the engaging protrusion is formed at a position corresponding to the number of teeth of the chain link between clampers of the drive sprocket. The bookbinding machine according to claim 2 . The bookbinding machine according to claim 3, wherein the number of engagement protrusions is four and the number of engagement levers is two .

Images