JPS6117724B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp device that clamps collated books in a bookbinding machine in order to transport them through each process.

2. Description of the Related Art Automatic bookbinding machines have been known that automatically perform everything from gluing to attaching a cover. This type of bookbinding machine has a large number of clamp devices arranged at regular intervals on a clamp chain stretched between sprockets at both ends of the machine. In addition to the clamp chain, there are a main body feeder that supplies the contents of the book (hereinafter referred to as the main body), a cover feeder that supplies the cover, and a device that receives work and performs bookbinding.
It is also equipped with work stations such as rulers, cutters, gluing, gauze, cover registration, press, delivery, etc., which are arranged in the circulation path of the chain.

As the above-mentioned clamping device, one that is schematically shown in a plan view in FIG. 1 is generally known. The clamping device, which is generally designated by the reference numeral 1 in the figure, has an inner clamping plate 2, and a driven frame 4 is slidably fitted into two sliding shafts 3 implanted in the inner clamping plate 2. This driven frame 4 is connected to the sliding shaft 3.
It is biased in the direction away from the inner clamping plate 2 by a compression coil spring 5 elastically loaded in the inner clamping plate 2. On the other hand, support shafts 6 parallel to the sliding shaft 3 are provided at both ends of the driven frame 4.
The support shaft 6 is slidably passed through both ends of the inner clamping plate 2, and the outer clamping plate 7 is fixed to the tip thereof. Also, driven frame 4
A cam follower 9 is rotatably supported in sliding contact with the cam 8, and the driven frame 4 is integrated with the outer clamping plate 7 due to the height of the cam surface of the cam 8 and the elastic force of the compression coil spring 5. As a result, it slides on the sliding shaft 3. Each clamping device 1 is connected by a chain 10, and the main body 11 is clamped by the clamping plates 2 and 7 on both sides and is transferred by the running of the chain 10. In the final delivery process, the cam 8 is released from the clamping device by separating the outer clamping plate 7 from the inner clamping plate 2 against the elastic force of the compression coil spring 5.

The opening width of the clamping plates 2 and 7 on both sides of the clamping device 1 configured as described above generally has a maximum value in accordance with the expected thickness of the main body 11, which is the thickest.
The stroke is set to about 90mm, but the actual stroke required during the bookbinding process is about 25 to 30mm, and 40 to 50mm.
The opening width of about mm varies depending on the thickness of the main body 11. Therefore, if the clamping plates 2 and 7 are to be opened and closed by 90 mm directly by the cam 8, the cam 8
The stroke of Yaspane 5 becomes larger, and there are many unnecessary movements, resulting in a lack of high-speed performance.
A method has been adopted in which the outer clamping plate 7 is adjusted depending on the thickness of the outer clamping plate 7.

Figures 2a and 2b show examples of conventional opening width adjusting devices, and the one shown in figure a has a threaded portion at the tip of the support shaft 6 that passes through the inner clamping plate 2. Then, the outer clamping plate 7 is attached to the nut 12.
It is fixed to the support shaft 6 by. A collar 13 is interposed between the outer clamping plate 7 and the support shaft 6, and depending on the thickness of the body, this collar 13
The opening width can be adjusted by attaching and detaching. Also b
In the one shown in the figure, another fixing plate 14 is provided outside the outer clamping plate 7, and this fixing plate 14
A fixed outer frame is formed by the support shaft 6 and the driven frame 4. Three bolts 15 are screwed into the fixed plate 14, and these bolts 15 are used to adjust the opening width. is scale 1
6 has been applied.

However, in the case shown in FIG. Not only does the protruding protrusion pose a danger during operation, but the support shaft 6 is fixed to the driven frame 4 and cannot be attached or detached, resulting in poor workability at each station. In addition, in the case shown in figure b, 3
It is necessary to adjust the number of bolts on the average, and it takes a long time when the amount of adjustment is large, and even if the fixing plate 14 is fixed and the body is thin, it is always at the maximum open position. Therefore, not only was the workability of each station poor, but also three bolts 15 had to be removed when attaching and detaching the outer clamping plate 7, which was a tedious task.

Furthermore, in addition to those shown in FIG. 2, the sliding shaft 3 shown in FIG. It has been proposed to roll on a rack provided with the tips of the teeth facing the shaft 6. By doing this, the stroke of the outer clamping plate 7 fixed to the support shaft 6 becomes twice the stroke of the driven frame 4, that is, the cam 8, and even if the main body is thick, the stroke of the cam 8 is small, so it is especially Although it does not require adjustment of the opening width, it has the disadvantage of a complicated structure and poor durability.

The present invention has been made in view of the above points, and includes a hollow slide shaft fixed to both ends of an outer clamping plate, which is slidably inserted into an insertion hole of a driven frame through an inner clamping plate, and The connecting rod passing through the slide shaft is rotated by a switching lever, and the switching claw at the tip thereof is configured to selectively engage with a plurality of grooves arranged in parallel in the axial direction of the connecting rod on the inner surface of the insertion hole of the driven frame. This makes it possible to change the opening width between the two clamping plates extremely easily and instantaneously by operating a lever, and also to improve work efficiency by making it easier to attach and detach the outer clamping plate and the slide shaft. This is what we provide.

The configuration and the like will be explained in detail below with reference to embodiments shown in the drawings.

3 to 7 show a clamp device according to the present invention, and FIG. 3 is a partially cutaway plan view of the clamp device;
4 is an enlarged longitudinal sectional view, FIG. 5 is a sectional view along AA of FIG. 3, FIG. 6 is a perspective view of the groove block, and FIG. 7 is an explanatory diagram of the switching operation. In these figures, the clamping device, which is generally designated by the reference numeral 21, has a rectangular flat inner clamping plate 2 that runs along the running track.
2, and the upper end has approximately 3 in the width direction.
Two guide shafts 23 are equally divided and installed toward the rear. This guide shaft 23 has an inner clamping plate 2
2, and a driven frame 24 formed by a member that is parallel in plan view and bearing portions protruding toward the inner clamping plate 22 at both ends and two central portions thereof, is slidable via a stroke bearing 25. It is fitted. Compression coil springs 2 are provided between both ends of the driven frame 24 and the inner clamping plate 22.
6 and 27 are loaded, and the driven frame 24 is always urged in a direction away from the inner clamping plate 22 by the springs 26 and 27. Note that the compression coil springs 26 and 27 are the springs 2 on the rear end side with respect to the running direction of the clamp device 21 shown by arrow B in the figure.
6 is formed so that its elastic force is stronger than that of the spring 27 on the starting end side.

A slide shaft insertion hole 28 having a rectangular cross section is bored in the bearing portions at both ends of the driven frame 24.
A slide shaft 29 formed in the shape of a hollow rectangular cylinder is slidably fitted into the insertion hole 28 parallel to the guide shaft 23 . The slide shaft 29 extends forward through square holes at both ends of the inner clamping plate 22, and has an outer clamping plate 30 fixed to its front end. is formed in half. Further, a connecting rod 31 is attached to the slide shaft 29 so that its rear end faces the half-split portion of the slide shaft 29, and its front end similarly faces the half-split portion of the slide shaft 29, and then protrudes from the outer clamping plate 30. It is inserted so that it can rotate freely. A torsion coil spring 32 is elastically mounted on the front end of the connecting rod 31, with both ends thereof fixed to the connecting rod 31 and the half portion of the slide shaft 29, respectively.
1 is biased counterclockwise by this torsion coil spring 32 as shown by arrow C in FIG. 5 when viewed from the rear, that is, from the driven frame 24 side. In addition, the fifth
The figure shows the connecting rod 31 on the rear end side,
The biasing direction of the starting end connecting rod 31 is clockwise;
Also, each member related to the connecting rod 31 shown later is the starting end,
It is symmetrically formed on both sides of the rear end.

A switching pawl 33 having an arc-shaped long diameter portion 33a and a notch 33b is fixedly attached to the leading end of the connecting rod 31 on the driven frame 24 side with a key 34, as shown in FIG. On the other hand, a rectangular block-shaped groove block 35 is attached to the inner surface of the slide shaft insertion hole 28 corresponding to this switching pawl 33, and this groove block 35 has a switching position parallel to the axial direction of the connecting rod 31. Long diameter portion 33 of claw 33
three grooves 35a, 35b, which selectively engage with a;
35c, and a lateral groove 35d that communicates half of these 35a, 35b, and 35c in the length direction. Furthermore, a ball bearing ring 37 that fits into the circular insertion hole 36 of the outer clamping plate 30 and is held in half of the slide shaft 29 is fixed to the front end of the connecting rod 31 by a knock pin. The receiving ring 37 is formed into a ring shape as shown in the front view in FIG. Engageable notches 37a and 37b are provided. Furthermore, the outer clamping plate 30 of the connecting rod 31
The switching lever 40 is fixed to the portion protruding from the outer clamping plate 30 by a knock pin with a lid 41 interposed between the switching lever 40 and the outer clamping plate 30. The switching lever 40 is the seventh
As shown in the figure when viewed from the front, a knob 40a is provided on which to rotate the fingertip, and a stopper 42 is provided on the lid 41 to restrict the rotation of the switching lever 40. ing. The slide shaft 29 fitting portions of the driven frame 24 and the outer clamping plate 30 are formed into halves for machining and mounting of groove blocks 35 and the like.

On the other hand, as shown in FIG. 4, a roller board 43 is integrally fixed at two locations on the starting end side and the ending end side of the inner clamping plate 2. is installed. A chain mounting shaft 45 is pivotally supported by this support arm 44.
A terminal link of a chain 46 that connects the adjacent clamp device 21 is mounted in the center thereof, and two guide rollers 47 and 48 are mounted in each of the upper and lower ends. . Of these guide rollers 47 and 48, the outer guide roller 47 faces a guide surface on the frame 49 side of a guide rail 50 having a U-shaped cross section and fixed to the machine frame 49 and constructed along each work station. The guide roller 48 is in contact with the opposite guide surface, and the clamping device 21 is in contact with the guide roller 48 .
As the vehicle travels, both guide rollers 47 and 48 rotate in opposite directions. Furthermore, guide rollers 51 and 52 are provided on the roller base plate 43 in opposition to the guide rail 50 for regulating movement of the clamp device 21 in the vertical direction. Further, cams 53 are attached to the paper input station portion and the delivery station portion of the guide rail 50.

On the other hand, at the center of the rear end of the driven frame 24,
A support frame 55 is integrally formed that slides on a guide plate 54 provided on the inner clamping plate 22 side and reciprocates in the front and back direction together with the driven frame 24, and a hardened ring 56 is attached to the outer periphery of the support frame 55 at its tip. A cam follower 57 fitted with a cam follower 57 is supported on the shaft. A cam 58 is located at the paper input station and the delivery station of the machine and slides the cam follower 57 onto the cam surface to slide the driven frame 24 on the guide shaft 3. Furthermore, a pair of vertically parallel brackets 59 and 60 are projected from the inner clamping plate 22, and a piston pin 62 is slidably fitted between these brackets via a bush 61. A pin 63 is provided at the center of the piston pin 62 so as to cross the piston pin 62 and engage in a long hole in the bush 61, and rollers 64 are fitted at both ends of the pin 63. A pair of upper and lower discs 65 and 66 are rotatably mounted on the bush 61, and between the upper and lower discs 65, 66,
It rotates with the lower disc 66 by a pin 67 implanted in the lower disc 66, and a compression coil spring 68
The clutch plate 6 is urged toward the upper disk 65 by
9 is slidably provided. A clutch surface that can be freely connected and disconnected is formed between the clutch plate 69 and the upper disc 65. Furthermore, the upper and lower discs 6
A pair of upper and lower levers 71 and 72, one end of which is pivotally attached to the support frame 55, are pivotally attached to the upper and lower ends of the levers 71 and 72, and the upper end of the piston pin 63 is in contact with the cam 53. A cam follower 73 is rotatably supported. Note that the cams 53, 5
Regarding the structure and operation of the clutch mechanism that operates with a clutch mechanism such as 8, please refer to Japanese Patent Application Laid-Open No. 125129/1983.

The operation of the clamp device 21 configured as above will be explained. First, a series of clamping devices 21 connected by a chain 46 are connected to a guide rail 5.
0 and reaches a delivery station (not shown), the cam follower 73 contacts the cam 53 and the piston pin 61 is pushed down, and the clutch plate 69 is also pushed down by the roller 64 and moved up. The clutch surface with the disk 65 is cut. At the same time, the cam follower 57 comes into contact with the convex surface of the cam 58, the driven frame 24 is pushed, and the outer clamping plate 30 connected thereto by the slide shaft 29 also moves in a direction away from the inner clamping plate 22. Further, as the driven frame 24 is pushed, the support frame 55 rotates the upper disk 65 connected via the lever 71 in the counterclockwise direction in FIG. Then rotate the lower disk 66 clockwise.
At this time, the cam follower 73 comes into contact with the concave portion of the cam 53, so the piston pin 62 is pushed up via the clutch plate 24 by the elastic force of the compression coil spring 68 and is connected to the upper disk 65 at the clutch surface.
The support frame 55 and therefore the driven frame 24 are fixed at this position. Then, the clamp device 21 circulates while maintaining an opening width equal to the stroke of the cam 58 and reaches the paper input station.

At the paper entry station, one of the books to be bound is
After the cam follower 57 is guided between both clamping plates 22 and 30, the cam follower 57 comes into contact with another cam fixed to the device frame 49 side, and the elastic force of the compression coil springs 26 and 27 causes the upper disc The force in the mutually meshing direction acting between the and the clutch plate 69 is released, and at the same time, the cam 53 attached to the guide rail 50 contacts the cam follower 73, the piston pin 62 descends, and the clutch plate 69 is lowered against the elastic force of the compression coil spring 68, and the upper disc 65 and the clutch plate 69 are separated. Therefore, after this, the distance between the inner clamping plate 22 and the outer clamping plate 30 is regulated by the relationship between the cam follower 57 and the cam.
After that, when the position of the main body is regulated by the ruler, the cam follower 57 reaches the recess of the cam, and
The main body is held by both clamping plates 22 and 30, and this holding force is provided by compression coil springs 26 and 27.

Therefore, in this clamping device 21, the opening width and adjustment between the two clamping plates 22 and 30, which are performed according to the thickness of the main body, and the attachment and detachment of the outer clamping plate 30 to and from the driven frame 24 are shown in FIGS. 3 and 7. I will explain. a-1, 2, and 3 in Fig. 7 are the outer clamping plates 3
0 indicates a state connected to the driven frame 24,
The slide shaft 29 fixed to the outer clamping plate 30 is fitted into the insertion hole 28 of the driven frame 24, and the switching pawl 33 on the connecting rod 31 is inserted into the slide shaft 29 with its axial movement restricted. The large diameter portion 33a is inserted into the grooves 35a, 35b, 3 of the groove block 35.
Since it is selectively engaged with either of 5c,
This restricts the movement of the slide shaft 29 in the axial direction. At this time, the rotation of the ball bearing ring 37 coaxial with the switching pawl 33 is restricted by its notch 37a engaging with the ball 39 which is elastically repelled by the compression coil spring 38. When the thickness of the main body changes and the opening width is adjusted, the knobs 40a of the left and right switching levers 40 are simultaneously rotated in opposite directions using the fingertips of both hands, as shown in Figure 7b-3. As shown in FIG. Since the tip of the finger can sense that it is facing the notch 37b, it can be easily confirmed that it is in this position. Therefore, when switching to the center groove 35b, after slightly moving the slide shaft 29, release the knob 40a and continue moving.
1 is rotated by the elastic force of the torsion coil spring 32, so that the groove 35b can be easily selected. When switching to the grooves 35a or 35c at both ends, move the slide shaft 29 while holding down the knob 40a, and the slide shaft 29 will stop moving at the position where the switching pawl 33 faces the grooves 35a or 35c. The position can be easily selected by releasing the knob 40b. In this example, the stroke of the cam 58 is 45 mm, and the opening amount at each position is 0 to 45 mm, 22.5 mm.
There are three levels: ~67.5mm and 45~90mm. Furthermore, when attaching and detaching the outer clamping plate 30 to and from the driven frame 24, the switching lever 40 is rotated until it comes into contact with the stopper 42 as shown in Fig. 7c-3, and as shown in Fig. c-1. The switching claw 33 is connected to the groove block 35
Since the slide shaft 29 is disengaged from the driven frame 24, the slide shaft 29 can freely slide relative to the driven frame 24. Therefore, if the outer clamping plate 30 is moved while the switching lever 40 is rotated, the driven frame 24 can be moved. It can be easily and instantaneously attached to and detached from the frame 24. In this way, while the outer clamping plate 30 is integrated with the slide shaft 29, the driven frame 2
By removing it from 4, only the driven frame 24 and the inner clamping plate 22 can be moved between the work stations, facilitating setup changes and detailed adjustments.

In addition, in this embodiment, the compression coil spring 26, which is elastically resilient between the driven frame 24 and the inner clamping plate 22,
27, the spring 26 on the terminal end side with respect to the running direction of the clamp device 21 is made stronger than the spring 27 on the starting end side. The strength of the spring equalizes the tendency for the starting end to become tight due to the fact that the starting end is tightened based on the terminal end. In other words, the strength ratio of both springs 26 and 27 is
It is set to be inversely proportional to the distance from the center of the maximum body dimension to the springs 26, 27.

Further, in this embodiment, guide rollers for guiding the movement of the clamp device 21 are shown in FIG.
As shown in 8, two rollers are provided on the upper and lower sides, and each roller is brought into contact with the opposing guide surfaces of the guide rail 50, but by doing so, the guide roller on one side can be brought into contact with the guide surfaces on both sides at the same time. This improves high-speed performance because the guide rollers do not slide on the guide surface or alternately contact the guide surfaces on both sides and the direction of rotation changes constantly, unlike in conventional rollers that are provided one at a time. .

In addition, by fitting the hardened ring 56 to the outer circumferential surface of the cam follower 57, the follow-up rotation when it hits the cam 58 is made smooth and the rigidity is improved.

In this embodiment, the groove block 35 has three grooves, 35a, 35b, and 35c, but any number may be used as long as there are a plurality of grooves. Further, these grooves may be provided directly on the inner surface of the fitting hole 28 of the driven frame 24 without providing the groove block 35.

As is clear from the above description, according to the present invention, in the clamping device of a bookbinding machine, the hollow slide shaft fixed to both ends of the outer clamping plate is slid into the insertion hole of the driven frame through the inner clamping plate. In addition to freely fitting the connecting rod through the inside of the slide shaft, the connecting rod is rotated using a switching lever, and the switching claw at the tip of the connecting rod is selectively inserted into multiple grooves parallel to each other in the axial direction of the connecting rod on the inner surface of the fitting hole of the driven frame. By configuring them so that they engage with each other, the opening width between the two clamping plates can be changed very easily and instantaneously by lever operation when the thickness of the main body changes. In addition, the outer clamping plate and slide shaft can be attached and detached from the driven frame and inner clamping plate very easily, improving work efficiency at each work station, and also making it easier to remove the main body when it gets stuck in the clamp. It's extremely easy. Furthermore, when the main body is thin, the thickness of the device can be reduced accordingly, which improves workability, and the slide shaft and the like do not protrude during travel, making it extremely safe.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a clamping device, FIGS. 2a and 2b are explanatory diagrams of an opening width adjusting device in a conventional clamping device, and FIGS. 3 to 7 show a clamping device of a bookbinding machine according to the present invention. Fig. 3 is a partially cutaway plan view, Fig. 4 is an enlarged vertical sectional view, Fig. 5 is a sectional view along AA of Fig. 3, Fig. 6 is a perspective view of the groove block, and Fig. 7 is a partially cutaway plan view. is an explanatory diagram of the switching operation. 21... Clamp device, 22... Inner clamping plate, 2
3... Guide shaft, 24... Followed frame, 26, 27...
...Compression coil spring, 28...Slide shaft insertion hole,
29...Slide shaft, 30...Outer clamping plate, 31...
...Connecting rod, 32...Torsion coil spring, 33...
Switching claw, 35a, 35b, 35c...groove, 40...
...Switching lever, 46...Chain.

Claims (1)

[Claims] 1. By a spring means elastically loaded between an inner clamping plate fixed to the chain of a chain conveyor and the inner clamping plate slidably fitted to a plurality of guide shafts implanted in the inner clamping plate. A driven frame biased in a direction away from the inner clamping plate, and a driven frame slidably fitted into both ends of the inner clamping plate parallel to the guide shaft, one end of which is fitted into both ends of the driven frame. A hollow slide shaft to which an outer clamping plate is fixed at the other end, a connecting rod that is inserted into the slide shaft so as to be rotatable but restricted from moving in the axial direction, and the tip of the connecting rod on the driven frame side. a switching pawl that is fixed to and has a protruding piece that protrudes in one direction on the outer periphery; and a plurality of pieces that are arranged in parallel in the axial direction of the connecting rod and selectively engage the switching pawl on the inner surface of the slide shaft insertion hole of the driven frame. a groove, and a switching lever that is fixed to an end of the connecting rod on the outer side of the clamping plate and rotates the connecting rod so as to release the engagement between the switching pawl and the groove against the bias of a spring means. A clamping device for a bookbinding machine that is characterized by: