JPH0512245B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a chain conveyor in which feed pawls are attached to each of a plurality of chains, and a conveyed object is held and conveyed from the front and back by these feed pawls. ,
In particular, the present invention relates to a phase adjustment device for a chain conveyor that adjusts the spacing between the feed claws.

[Conventional technology]

Chain conveyors, which convey goods using feed claws attached to a chain, have been known for a long time.
In addition, chain conveyors of this kind are already in use, which are equipped with a phase adjustment device for changing the interval between the front and rear feeding claws so that they can be applied to various objects of different sizes. For example, if you have two sprockets each with two chains running around them, one of the sprockets is made with an elongated hole so that the other sprocket can rotate relative to the sprocket, and a bolt screwed into the sprocket is made to rotate relative to the other sprocket. is inserted into the elongated hole and tightened and fixed with a nut. Loosen these bolts and nuts to rotate both sprockets relative to each other, thereby adjusting the phase of the two chains, that is, adjusting the phase of both feed pawls. This changes the interval.

In this type of phase adjustment device, one of the sprockets is rotated after the connection between both sprockets is disconnected, so it is difficult to accurately set the spacing between the front and rear feed pawls, and it is difficult to manually set the spacing between the front and rear feed pawls. Therefore, there were various drawbacks such as complicated and time-consuming operations.

Therefore, in order to enable accurate adjustment, we developed a size changing device (Japanese Patent Application Laid-Open No. 1989-1999) equipped with a gear mechanism that can rotate the driven shaft while keeping the driving shaft fixed.
183326) has already been proposed.

[Problem that the invention seeks to solve]

However, the conventional configuration described above requires the addition of a large number of gears for adjustment, resulting in a complicated structure and high cost.

The present invention has been made to eliminate these drawbacks, and provides a phase adjustment device for a chain conveyor that can accurately adjust the distance between the front and rear feed claws with a simple configuration.

[Means for solving problems]

The phase adjustment device for a chain conveyor according to the present invention fixes one of the first and second sprockets, each of which has a chain around it, to a drive shaft, and rotatably supports the other sprocket on this shaft, parallel to the drive shaft. A chain conveyor that rotates both sprockets at a constant speed by fixing a gear to a driven shaft, which is disposed on the shaft and transmits the rotation of the drive shaft through a gear mechanism, and meshing with the gear attached to the rotatable sprocket. A drive gear fixed to the drive shaft of the gear mechanism, a driven gear fixed to the driven shaft, and a floating gear supported by a first floating shaft parallel to the drive shaft and meshed with the drive gear; a transmission gear supported by a second floating shaft parallel to the drive shaft and transmitting the rotation of the floating gear to a driven gear; an axis of the floating gear and an axis of the transmission gear; and an adjustment gear that is rotatably supported by the drive shaft and has the shaft of the idler gear fixed at an eccentric position, and that moves the idler gear by its rotation. It is something.

[Effect]

In the chain conveyor phase adjustment device according to the present invention, by moving the idle gear with the drive shaft fixed, the driven shaft is rotated, only one sprocket is rotated, and both chains are relatively moved.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments. Fig. 1 is a cross-sectional view of a phase adjusting device for a chain conveyor according to an embodiment of the present invention, Fig. 2 is a side view thereof, and Fig. 3 is a sectional view passing through the axis of each gear constituting the gear configuration. . Two sprockets 106 are fixed to the drive shaft 102, and a second sprocket 112 to which a gear 110 is attached is rotatably supported between these two sprockets 106. A driven shaft 1 arranged parallel to the drive shaft 102
16 fixed gears 118 and the gear 110 are meshed with each other.

A chain is wound between each of the sprockets 106 and 112 and a sprocket provided on another idle shaft (not shown), and when the drive shaft 102 rotates, this rotation is caused by a gear mechanism which will be explained later. 120 to the driven shaft 116 and causes the middle sprocket 112 to rotate at the same speed as the sprockets 106 on both sides through gears 118 and 110. Note that the second sprocket 112, which is rotatable with respect to the drive shaft 102, is
Of course, it is good to use it as an individual.

The chain has a drive shaft 10 as shown in FIG.
sprocket 106 fixed to 2, i.e. the chain 22 of the outer sprocket, and the drive shaft 102
Feed pawls 26 and 28 facing different directions are attached to the sprocket 112 rotatably supported by the sprocket 112, that is, the chain 24 of the inner sprocket. , 29b are held and conveyed.

Next, the gear mechanism 120 that transmits the rotation of the drive shaft 102 to the driven shaft 116 will be explained. Drive shaft 1
A drive gear 130 is fixed to the end of 02, and this gear 130 has a first intermediate gear (idling gear) 132,
A second intermediate gear (transmission gear) 134 and a driven gear 150 fixed to the end of the driven shaft 116 mesh in sequence.

The first and second intermediate gears 132, 134 are
These first and second floating shafts 170 and 172 are supported by floating shafts 170 and 172, respectively.
72 are rotatably connected by a link 174, and a second floating shaft 172 is connected to the link 176.
It is connected to the driven shaft 116 by. These gears 130, 132, 134, 150 constitute the gear mechanism 120, and the drive shaft 1
02 rotates, the rotation of the drive gear 130 fixed to the drive shaft 102 is transmitted to the driven gear 150 fixed to the driven shaft 116 via the first intermediate gear 132 and the second intermediate gear 134, and the driven shaft is rotated. 116
It is designed to rotate.

A sector gear (adjustment gear) 178 is rotatably fitted to the outer periphery of the boss 130a of the drive gear 130. This sector gear 178 is a gear 164 fixed to the output shaft 162 of the servo motor 160.
and one end thereof is fixed to the first floating shaft 170. Therefore, when the servo motor 160 is operated, the sector gear 178 rotates around the axis of the drive shaft 102, and the first floating shaft 170 is moved accordingly.

During normal operation of the chain conveyor having the above configuration, the rotation of the drive shaft 102 is controlled by the drive gear 13.
The sprocket 10 is transmitted to the driven shaft 116 via the first and second intermediate gears 132, 134 and the driven gear 150, and is fixed to the drive shaft 102.
6 and a second sprocket 112 located therebetween rotate at a constant speed, causing chains 22 and 24, which are wound around both sprockets 106 and 112, respectively, to move synchronously.

In addition, as shown by imaginary lines in FIG. 4, in order to apply to articles 29a and 29b of different sizes,
By relatively moving both chains 22, 24, the distance between the front and rear feed claws 26, 28 attached to these chains 22, 24, respectively, is adjusted. In this case, the sector gear 178 is rotated by a predetermined angle by the servo motor 160 while the drive shaft 102 is stopped. As a result, the first floating axis 170
moves around the axis of the drive shaft 102. The first intermediate gear 132 supported by the floating shaft 170 meshes with the drive gear 130 that is fixed to the drive shaft 102 and is stopped, and while moving around the drive gear 130, the first intermediate gear 132 also engages with the drive gear 130 while moving around the drive gear 130. It revolves around the heart.

The first floating shaft 170 is connected to the second floating shaft 172 via a first link 174 , and the second floating shaft 172 is connected to the driven shaft 1 via a second link 176 .
16, and the distances between the first floating shaft 170 and the second floating shaft 172, and between the second floating shaft 172 and the driven shaft 116 do not change. Since the relative position can be changed, the first intermediate gear 13
As gear 2 rotates and moves, this gear 13
A second intermediate gear 134 meshing with the intermediate gear 1 rotates itself and moves around the driven shaft 116,
A driven gear 150 that meshes with 34 also rotates.

As a result, it is possible to rotate the driven shaft 116 while the drive shaft 102 is stopped, and by rotating only the second sprocket 112, both chains 2 to which the front and rear feed pawls 26 and 28 are respectively attached are rotated.
2 and 24 can be moved relative to each other. As described above, in this embodiment device, both sprockets 1
Since only one sprocket can be rotated without interrupting the connection between the sprockets 06 and 112, the interval between the front and rear feed pawls 26 and 28 can be adjusted accurately.

Moreover, in the above embodiment, the gear 1 that transmits rotation from the drive shaft 102 to the driven shaft 116 during normal operation is
The middle two gears 132, 134 among the gears 30, 132, 134, 150 are supported by the floating shafts 170, 172 to be freely movable, and these are connected by links 174, 176, so that the servo motor 160 The spacing between the feed pawls 26 and 28 can be adjusted with a simple structure of just adding one sector gear 178 that meshes with the gear 164 of the rotating shaft 162. Furthermore, since there are no intersecting axes, it is advantageous in terms of space.

〔Effect of the invention〕

As described above, according to the present invention, with an extremely simple configuration, only one sprocket can be rotated without interrupting the connection between the two sprockets that advance the chains to which the front and rear feed pawls are attached. Therefore, the chain phase can be adjusted accurately.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a phase adjustment device for a chain conveyor according to an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a cross-sectional view passing through the axis of each gear constituting the gear mechanism, and FIG. Figure 4 is an enlarged view of the chain. 22: Chain, 24: Chain, 102: Drive shaft, 106: First sprocket, 110: Gear of second sprocket, 112: Second sprocket, 116: Driven shaft, 118: Second gear,
120: Gear mechanism, 130: Drive gear, 132:
Floating gear, 134: Transmission gear, 150: Driven gear, 170: First floating shaft, 172: Second floating shaft, 174: Link, 176: Link, 178:
adjustment gear.

Claims (1)

[Claims] 1 a first sprocket fixed to the drive shaft;
a second sprocket rotatably supported by the drive shaft and having a fixed gear;
a chain wound around each second sprocket; a driven shaft disposed parallel to the drive shaft;
A second gear that is fixed to the driven shaft and meshes with the gear, and a gear mechanism that transmits the rotation of the drive shaft to the driven shaft, transmits the rotation of the drive shaft to the second sprocket via the driven shaft, In the chain conveyor that moves both chains synchronously, the gear mechanism is supported by a drive gear fixed to a drive shaft, a driven gear fixed to a driven shaft, and a first floating shaft parallel to the drive shaft. an idler gear that meshes with the drive gear; a transmission gear that is supported by a second floating shaft parallel to the drive shaft and transmits the rotation of the idler gear to the driven gear; an axis of the idler gear, an axis of the transmission gear, and A link rotatably connects the shaft of the transmission gear and the shaft of the driven gear, and is rotatably supported by the drive shaft, and the shaft of the above-mentioned floating gear is fixed at an eccentric position. A phase adjustment device for a chain conveyor, comprising an adjustment gear for moving a gear, and rotating the driven shaft by moving the idle gear with the drive shaft fixed, thereby relatively moving both chains. .