CAN SEAMER

Abstract: The known can seamer in which a can drum filled with liquid and having a can lid placed on the opening at the top is subjected to seaming work by means of seam­ ing rolls and a seaming chuck, is improved so that a replacement time for the seaming rolls and the seaming chuck in the case of changing the diameter of the cans can be greatly shortened. The improvements reside in that a seaming lever (14) having the seaming rolls (11 and 12) mounted thereon and the seaming chuck (13) are respectively connected to the bottom end portions of a seaming roll shaft (15) and a rotary cylinder (21) via splines or serrations (15a and 22), and the seaming lever and the seaming chuck are integrally con­ nected by means of a connecting bracket (27).

Description: The present invention relates to a can seamer in which a can filled with liquid and having a can lid placed on the opening at the top is subjected to seaming work by means of seaming rolls and a seaming chuck. Description of the Prior Art: One example the heretofore known can seamers will be explained with reference to Fig. 7. In this figure reference numeral 1 designates seaming rolls which are rotatably mounted on shafts 3 and 4, respectively, which are fixedly secured to a seaming lever 2. Reference numeral 5 designates a seaming chuck which is fixedly secured by a screw to the bottom of a rotary cylinder tube 6, and at the bottom of a knock-out rod 7 which extends through the rotary cylinder tube 6 in a vertically slidable manner, is fixedly secured a knock-out pad 9 by means of a screw 8. The knock-out pad 9 is projectable from a recessed portion 10 at the bottom of the above-mentioned seaming chuck 5. In the above-mentioned known can seamer in the prior art shown in Fig. 7, the shafts 3 and 4 having the seaming rolls 1 mounted thereon and the seaming chuck 5 were separately fixed by screws to the seaming lever 2 and the rotary cylinder tube 6, respectively. Accordingly, upon changing the can drum diameter and the can lid diameter, the mounting shafts 3 and 4 having the seaming rolls mounted thereon and the seaming chuck 5 fixed to the rotary cylinder tube 6, respectively, had to be replaced separately, and there were various problems such that since these members were fixed by screws and a large number of seaming rolls and seaming chucks were disposed in the seamer, a long time was necessitated for replacing these members, and moreover the relative adjustment of these members in the vertical direction as well as the adjustment in the horizontal direction necessitated a long time for realizing a high precision. SUMMARY OF THE INVENTION: It is therefore one object of the present invention to provide an improved can seamer which is free from the above-mentioned shortcomings of the can seamers in the prior art. A more specific object of the present invention is to provide a can seamer which does not necessitate a long time for replacing seaming rolls and a seaming chuck when the can drum diameter and the can lid diameter are changed. According to the present invention, there is provided a can seamer having the combination of features of the sole claim. According to the present invention, in the case where it is necessary to replace the seaming rolls and the seaming chuck, if the same seaming rolls as well as the same seaming chucks are pulled downwards as gripped by hands, then at the spline portion or the serration portion, the same rolls and chuck can be taken out integrally as connected via the connecting bracket. Subsequently, in order to mount other seaming rolls and another seaming chuck having changed sizes, by merely pushing up the seaming rolls and the seaming chuck by hands with their respective splines (or serrations) aligned with the splines (or serrations) at the connecting portion, mounting of the seaming rolls and the seaming chuck can be achieved easily, and thereby the replacement by the new members having the changed size can be performed quickly. The above-mentioned and other objects and advantages of the present invention will become more apparent by reference to the following description of preferred embodiments of the invention taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS: In the accompanying drawings: Fig. 1 is a plan view showing a part of a can seamer according to one preferred embodiment of the present invention; Fig. 2 is a schematic partial side view as viewed in the direction of arrow A in Fig. 1; Fig. 3 is a cross-section view taken along line B-B in Fig. 1 as viewed in the direction of arrows; Fig 4 is a plan view showing a part of a can seamer according to another preferred embodiment of the present invention; Fig. 5 is a cross-section view taken along line C-C in Fig. 4 as viewed in the direction of arrows; Fig. 6 is a schematic partial side view as viewed in the direction of arrow D in Fig. 4; and Fig. 7 is a longitudinal cross-section view showing seaming rolls and a seaming chuck in a heretofore known can seamer. DESCRIPTION OF THE PREFERRED EMBODIMENTS: Now the present invention will be described in greater detail in connection with preferred embodiments of the invention illustrated in the accompanying drawings. In a first preferred embodiment of the present invention shown in Figs. 1 to 3, reference numeral 11 designates a first seaming roll, numeral 12 designates a second seaming roll, and numeral 13 designates a seaming chuck. Reference numeral 14 designates a seaming lever, which is inserted into a seaming roll shaft 15 via a spline (or serration) 15a so that it can be drawn out downwards. However, it is fixed to the same shaft 15 so as to be able to rotate integrally therewith, and in addition, shafts 16 are fixed to the same seaming lever 14. The seaming rolls 11 and 12 are rotatably suspended at the center of the bottoms of the respective shafts 16 via bearings 18 fixed to the bottom portions of the shafts 16 by means of screws 17. On the other hand, the seaming chuck 13 is mounted via a spline (or serration) 22 to the bottom of a rotary cylinder 21 that is rotatably supported via a bearing 20 from a can seamer main body 19 so that the seaming chuck 13 can rotate integrally with the rotary cylinder 21. In addition, a knock-out rod 23 extends through the rotary cylinder 21 in a vertically slidable manner, and at the bottom of this rod 23 is fixed a knock-out pad 24 by means of a screw 25. The knock-out pad operates to be projected from a recess 26 at the bottom of the seaming chuck 13 to cause a packaging can subjected to a seaming work to be disengaged from the seaming chuck 13. Reference numeral 27 designates a connecting bracket which integrally connects the seaming lever 14 with the seaming chuck 13. More particularly, this connecting bracket 27 is connected with the seaming chuck 13 via flanges 28 provided on its outer circumference, also it is connected with the seaming lever 14 via rings 29, and these rings 29 are rotatably fixed by means of a lock nut 30 engaged with the connecting bracket 14. In addition, reference numeral 31 designates bolts for positioning the seaming chuck 13 in the vertical direction with respect to the rotary cylinder 21. Upon seaming a can, normally the can exerts a push-up force upon the seaming chuck 13, and so, an upward force is also exerted upon the seaming rolls which are connected with the seaming chuck 13 by means of the connecting bracket 27. However, in order to prevent the seaming rolls, the connecting bracket and the seaming chuck from dropping at the time when the can seaming is not effected, a cam 35 is rotated about the center axis of the shaft 37 by means of a lever 36 and is pressed against the seaming roll shaft 15, and thereby drop of these members can be prevented. Now description will be made of the operation of the above-described can seamer. When it is necessary to replace the seaming rolls 11 and 12 and the seaming chuck 13 in accordance with change of the can lid diameter, after the lever 36 has been turned about the shaft 37 to separate the cam 35 from the seaming roll 15, the seaming rolls 11 and 12 and the seaming chuck 13 are pulled down as gripped by hands, then since the seaming lever 14 and the seaming chuck 13 are integrally connected by the connecting bracket 27, the seaming lever 14 is disengaged from the seaming roll shaft 15 via the spline 15a, also the seaming chuck 13 is disengaged from the rotary cylinder 21 via the spline 22, and thus they can be pulled down integrally by the intermediary of the connecting bracket 27. Subsequently, in order to mount a new seaming lever 14 having seaming rolls 11 and 12 of the changed size mounted thereon and a new seaming chuck 13 of the changed size, the mounting can be done within a short period by merely aligning the spline of the new seaming lever 14 with the spline 15a of the seaming roll shaft 15 and the spline of the new seaming chuck 13 with the spline 22 and pushing them up, because the spline diameters of the new members are identical to those of the old ones. Figs. 4 to 6 illustrate a second preferred embodiment of the present invention, in which a connecting bracket 27 is directly mounted to a can seamer main body 19 via a mounting bracket 41. More particularly, as shown in Fig. 5 which is a cross-section view taken along line C-C in Fig. 4, a seaming lever 14 and a seaming chuck 13 are rotatably mounted to the connecting bracket 27. In addition, the mounting bracket 41 is fixedly secured to the can seamer main body 19 by means of bolts 46, and at the outer circumferential portion of the same bracket 41 is mounted a pin 43 so as to be movable in its axial direction as biased by a spring 45 towards its innermost position. In the case where the mounting bracket 41 and component parts integrally connected therewith are to be dismounted, a knob 42 at the outer end of the pin 43 is pulled and rotated to make a transverse pin 44 projected from the pin 43 engaged with a projected portion of the mounting bracket 41, thereby the tip end of the pin 43 is held retreated, and then the mounting bracket 41 is pulled out downwards. On the contrary, upon mounting these members, the mounting bracket 41 is inserted under the above-mentioned condition, the tip end of the pin 43 is inserted into a tapered hole formed in one part of the bracket 41 to fix the mounting bracket 41 against vertical movement and rotation. The modified embodiment shown in Figs. 4 to 6 is not different in effects and advantages from the first embodiment shown in Figs. 1 to 3. Since the can seamer according to the present invention is constructed as described in detail above and in the can seamer the seaming rolls and the seaming chuck can be replaced simultaneously as integrated via the connecting bracket, various advantages can be realized such that replacement time can be shortened greatly as compared to the case where the seaming rolls and the seaming chuck are respectively separately replaced as is the case with the prior art, and that time for mutual fine adjustment of these members is quite unnecessary as compared to the case where these members are separately mounted and individually adjusted as is the case with the prior art.

Claims: A can seamer comprising a first and a second seaming roll (11, 12) rotatably mounted to respective shafts (16), a seaming lever (14) to which said shafts (16) are affixed, a rotary cylinder (21) having a lower end portion, and a seaming chuck (13) connected with said rotary cylinder (21), characterized in that, said seaming chuck (13) is mounted axially on said lower end portion of said rotary cylinder (21) by means of a spline or serration connection therebetween, such that said seaming chuck (13) is rotatable with said rotary cylinder (21), a seaming roll shaft (15) having a lower end portion is provided, said seaming lever (14) is mounted axially on said lower end portion of said seaming roll shaft (15) by means of a spline or serration connection therebetween, such that said seaming lever (14) is rotatable with said seaming roll shaft (15), locking means (35, 43) are provided to prevent axial movement of said seaming rolls (11, 12) and said seaming chuck (13) and a connecting bracket (27) is provided connecting said seaming lever (14) to said seaming chuck (13), such that said seaming lever (14) and seaming chuck, (13) are removable from and mountable on said seaming roll shaft (13) and said rotary cylinder (21), respectively, as a unit with said connecting bracket (27).

Inventors: MIHARA, HIROKATA, SHIMIZU, TERUO C/O NAGOYA MACHINERY WORKS, TAKAGI, KOICHI C/O NAGOYA MACHINERY WORKS, TAKAHASHI, HIDEO C/O MITSUBISHI METAL CORP., TASHIRO, KATSUNORI C/O MITSUBISHI METAL CORP.
Applicants: MITSUBISHI JUKOGYO KABUSHIKI KAISHA
Application year: 1988
Main classification: B21D51
IPC codes: B21D51, B65B7